100 Days of Deception Episode 7 Preview | "Did You Know Keum Is a Rare Surname?" Why Sato Stopped at Keum Seo-hee

⚠️ Spoilers for all of episode 6 (including the ending) and the official episode 7 preview. Interpretations and predictions are flagged in the text as "my take" and "my pick".

At the very end of episode 6, Sato, alone, murmurs two names side by side. Keum Seok-jung. And Keum Seo-hee. That one little mutter sent a chill down my spine.

Keum Seok-jung is the man who shot Sato at the banquet in episode 2. And Keum Seo-hee is the fake name our Ga-kyung uses at the Government-General.

But just before Sato puts those two names together, he asks Fukuda, the chief of police, a question.

"Did you know Keum is a rare surname?"

Rare, as in hardly anyone has it. At that one remark, Fukuda's face goes stiff.

The show is called 100 Days of Deception, after all. And episode 6 placed a single name right at the center of all that deception.

So today there's just one question. Why did Sato stop at the name Keum Seo-hee?

The answer was already scattered all over episode 6. I'll pull the clues out one at a time, in the order the scenes aired, and at the end I'll take apart the episode 7 preview and lay down our Gordon Insight picks.

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A Gun in the Rain

Let's start with the end of episode 5. Ga-kyung walked out into the rain, saying she was done being a spy, and Philip followed her with a gun hidden on him.

Episode 6 shows us right away who that gun was meant for. When Philip gets back to Heewon, So-ran blocks his way. He tells her to step aside and demands to know whether she's forgotten that traitors are to be dealt with. So-ran's reply: they were the ones who refused to trust Ga-kyung in the first place. As So-ran sees it, betrayal was never even one of Ga-kyung's options.

In the end, Philip backs down. He'll try to talk Ga-kyung round, just once. And that one attempt is the opening scene of episode 6.

The card Philip plays with Ga-kyung is So-ran's past. In Kyeam-ri, when So-ran's husband refused to give up his comrades, Sato killed his daughter. That daughter's name was Seo-hee. In other words, the name Ga-kyung is using, Keum Seo-hee, is the name of a child Sato killed.

Philip's last request is that she try to understand So-ran, just a little.

That night, lying there still soaked, Ga-kyung tells So-ran about her own mother. The mother who left her behind. And then she tells So-ran that, somehow, she envies Seo-hee a little. Because Seo-hee had a mother who would risk her life for her daughter.

Then the next morning, the first thing Ga-kyung asks So-ran is when they'll hit the Inspector General. How soon, if they push it as fast as they can? So-ran's answer is one month. Ga-kyung nails it down: in a month, no matter what, she gets sent to America. So-ran takes a breath, and promises.

This is where I got goosebumps. Back in episode 4, So-ran confided something to Philip: there was never any way to get Ga-kyung to America in the first place. Three months has shrunk to one, but this was a promise that could never be kept from the very start.

Ga-kyung works under a fake name, and the promise that keeps her going is fake too. But someone had already started looking into that fake name, and he got there first.

Two Sets of Orders

Hideo got slapped by Fukuda in episode 5. Sato's idea of praise for this adopted son, who is Korean by birth, is to tell him that keeping your feelings off your face is what makes you Japanese.

And his real business is Keum Seo-hee. He wants Hideo to make her lean on him and trust him. With one condition attached. She has to trust him, but "you must never do the same."

Just as Hideo's expression wavers, Sato adds one more thing. Wasn't that what his mother did, too? Hideo is secretly searching Gyeongseong for the adoptive mother who raised him. Sato knows exactly where that wound is, and presses right on it.

That same night, the very same order comes down at Heewon. This time from So-ran to Ga-kyung: win Sato Hideo's heart. So-ran's condition is that she must never let personal feelings in. Ga-kyung answers with total confidence that it will never happen.

Make them trust you, but never trust them back. Two people handed identical orders and sat down face to face. I think this mirror setup is the backbone of episode 6. And orders, of course, exist to be broken.

Ishikawa

Meanwhile at Heewon, Philip steps up to rescue the arrested Keum Seok-jung, So-ran's husband and Seo-hee's father. He'll find a way, he says.

His plan is to hit Sato where it hurts most: he'll say he's interested in the Kyeam-ri incident. So why is Kyeam-ri Sato's weak spot? Philip calls Sato the man behind the Kyeam-ri massacre, then corrects himself. No, Ishikawa.

Ishikawa. That's Sato's original surname. He rose in the world thanks to his wife's family, and even took their surname. So Sato is a man who erased his past by changing his name.

Keep that in mind. Think how touchy a man who wiped out his own name might be about other people's names.

But So-ran's answer comes as a surprise. Leave it to heaven, she says, and do nothing at all. Her reason is simple. If it comes out that Seok-jung was a victim of Kyeam-ri, her own identity could be exposed too.

When Philip asks whether that man isn't her husband, So-ran shakes her head. Then she tells Philip that he is her husband. To Philip it sounds like a confession. But to me it also sounded like her letting go of Seok-jung. So-ran is a woman who has already chosen revenge over her husband.

The Translation

The next day, at a Government-General construction site, the foreign engineer Laurent is furious. His Korean laborers keep calling in sick, every single day. But Hideo, putting this into Japanese, quietly changes what he says: the Korean laborers are being worked too many hours, so they're falling ill one after another.

Thanks to that, Sato orders their day cut by an hour. The little lie seems to have worked, but on the drive back, Sato asks: "Did you translate properly today?"

When Hideo asks what he means, Sato says he trusts him, and in the same breath gives an order. The laborers' hours are to go up by an hour every day.

I can't tell whether Sato understood the English or was just testing his son. Two things are certain, though. His son, Korean by birth, took the Korean workers' side. And Sato suspects that lie.

If he doubts even his own son's translation, is he going to trust his interpreter trainee, Keum Seo-hee?

Back to the Interrogation Room

Back at the office, what Hideo says to Ga-kyung is close to an apology. But her reply goes the other way: next time there's an interrogation to interpret, she wants to do even better. Hideo coldly draws a line. She can start by giving back the pawn ticket she stole from him.

Right then, the police turn up. The chief of police is summoning Keum Seo-hee again, for another interrogation of the same man as yesterday. Hideo's reaction is priceless: he wishes her a pleasant trip. But what comes next wipes the smile off his face. The Inspector General has ordered that Hideo go along too.

At Jongno Police Station, Fukuda explains the situation. They brought in a different interpreter, but Seok-jung keeps saying just one name: Keum Seo-hee. Keum Seok-jung has been asking for Keum Seo-hee.

Back in episode 5, the moment Fukuda called Ga-kyung Keum Seo-hee, Seok-jung reacted violently. It's the name of the daughter he lost thirteen years ago. And now the name starts to nag at Fukuda too.

Keep Fukuda's question mark in mind. At the end of episode 6, Sato comes back to exactly this spot.

The moment Ga-kyung walks into the interrogation room, she makes a slip. Speaking Korean, she says of Hideo that he speaks Japanese, English, and even Korean. A mistake? I don't think so. She said it in Korean on purpose, so Seok-jung would hear. The man behind me understands every word of Korean, so be careful. That's my take.

When Seok-jung stays silent, Ga-kyung asks to be allowed to talk to him in Korean. As a fellow Korean, she'll try to persuade him.

The first thing she reveals to Seok-jung is who she really is: that night in episode 2, he pointed a gun at her. Then, out of nowhere, she starts singing the praises of her madam. She's Chinese, so her Korean isn't great, but she's a good woman. And her madam even gave her the pretty name Keum Seo-hee.

When Seok-jung asks about his comrades, Ga-kyung swerves back to her madam again. She only hoped her madam would stay as healthy as she is now, for a long, long time.

It's a message, delivered right under Fukuda's nose. Your wife is alive, and she's safe. And she gave me your daughter's name. It must have been the first word of his wife Seok-jung had heard in thirteen years.

Then a policeman bursts in from the torture room. Seok-jung's comrade has talked. And what did they do to him? They broke his wife's legs. Then the officer reads out Seok-jung's record: "His name is Keum Seok-jung. They say he's from Kyeam-ri, in Suwon."

Kyeam-ri. Fukuda knows what that name means. A call goes straight to the Inspector General's office.

As Ga-kyung is being hauled out, Seok-jung calls one last request after her: buy some castella on the way home. Castella. To me, that doesn't sound like it's just about a snack. Either it's a last goodbye to So-ran, or it's a code only the two of them know. This is pure speculation on my part, but if castella shows up again in episode 7, that'll be our answer.

And Hideo, who understands every word of Korean, was standing behind them listening to all of it.

Gae-ttong

On the way up the stairs from the interrogation room, Hideo asks, as if he'd been waiting for the chance: so Keum Seo-hee isn't her real name? He heard her say her madam gave her that name. When he asks what her real name is, Ga-kyung's answer is Lee Gae-ttong, which means, roughly, dog poop.

Her real name is Lee Ga-kyung, so she's piled one more lie on top, right there on the spot. She even begs him to keep the name Gae-ttong secret from the Government-General. I burst out laughing.

But the joking suddenly turns serious. Hideo believes Ga-kyung is Philip's lover, remember. He snaps at her for cheating behind the back of a man who's been good to her.

Then Ga-kyung flips the table. She looks straight up at Hideo and asks: should she break it off with Yoo Philip? And then one more move. If she does, will he accept her feelings?

Hideo's answer is a surprise. Since it's come up, he says, let's go see Yoo Philip together, right now. When Ga-kyung falters, he tells her that her kind of person is the kind he hates most.

But turn this scene around and it gets interesting. Sato told him to make her trust him without trusting her. And right now Hideo is angry because he's jealous. The order is already cracking.

At that very moment, someone is heading down to the basement of Jongno Police Station in person.

Face to Face After 13 Years

Sato himself has come down to the interrogation room. He sits across from Seok-jung, says his name, and asks: has it been thirteen years? The name Seok-jung calls him by is Ishikawa Nobuyuki.

The very name Philip mentioned. The name Sato erased, Seok-jung has remembered for thirteen years. And then he calls him a butcher.

Sato's answer is shameless. It was a legitimate duty, he says; he was putting down a riot. Faced with a man who calls the independence cries a riot, Seok-jung fires back that all they did was shout "Manse!" peacefully. And the proof Sato produces is that he was acquitted at trial.

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Sato even drags Seok-jung's wife into it. If only he'd stayed out of the independence protests, he'd be living happily with his family by now. Seok-jung's reply was, I think, the best line of episode 6: "Happy? In a country that was stolen from us?"

Then a gunshot rings out. At that moment, somewhere in the same building, Ga-kyung freezes. Was that a gunshot?

What Sato says to Seok-jung is that the couple must have been very devoted to each other, devoted enough to die at the same moment. That gunshot was the comrade who gave up Seok-jung's name, and his wife. Then Sato tells Seok-jung he won't kill him. Instead, his cause of death will be illness.

Ga-kyung comes running down the stairs, and Hideo blocks her way. Whatever she's thinking, he says, it isn't that. She shakes off his hand and goes in, and what she finds is the man she was giving news of her madam to only moments ago: Keum Seok-jung, lifeless.

Fukuda walks up to her and makes a point of talking to her. The suspect died of sepsis, he says. And Ga-kyung has to play along and agree that he must have been a pathetic weakling. She has to run down, with her own mouth, the man she was just bringing news to. All to protect the name Keum Seo-hee.

She wants to go home alone, but Hideo comes after her. What does she mean, she's fine? What he grabs is her hand. It's shaking, he says.

Ga-kyung reaches home. How is she supposed to tell So-ran about her husband's last moments? How do I even tell her this, she murmurs to herself.

Then Hideo comes back and asks if she's okay. About to say she's fine, the way she always does, Ga-kyung says no. She is not okay. After lying all the way through episode 6, it's the first true thing she says.

So has Hideo won her trust, just as Sato ordered? Or has he started to feel the very thing Sato forbade?

1919, Jeam-ri

Meanwhile, Fukuda is reporting to Sato. Keum Seo-hee saw Seok-jung's body. What worries Fukuda is that if Yoo Philip finds out, it could turn into a problem the way Kyeam-ri did. Because "back then, too, a foreign reporter put it in the international press," and it ended up going to trial.

That line isn't pure fiction. Kyeam-ri is a made-up village, but it's modeled on the Jeam-ri massacre in Suwon in April 1919. Japanese troops herded more than twenty villagers into a church, opened fire, and set it ablaze.

One of the people who told the world about the massacre was Frank Schofield, a Canadian veterinary scientist and bacteriologist. He got photographs and testimony from the scene out of the country. Under the pressure of international opinion, the Japanese army lieutenant who commanded the operation was court-martialed. The verdict: not guilty. Exactly like Sato waving his acquittal in Seok-jung's face.

That's why the thing Sato fears most is a foreign reporter. And who is the lover of that foreign reporter, Yoo Philip? Keum Seo-hee.

Keum Is a Rare Name

Sato brushes off Fukuda's worries. Seok-jung died of illness. End of story.

But as Fukuda turns to leave, Sato stops him and asks the question from the top of this post: Keum is a rare surname. Then he tells him to get Suwon Police Station to dig up Keum Seok-jung's personal file and send it over. And when was that file drawn up? "There should be one drawn up thirteen years ago."

Suwon, thirteen years ago. That has to be a file made at the time of the Kyeam-ri incident. And what Sato muttered once he was alone were those two names from the very beginning.

But episode 6 has one more final scene. In the records room of Suwon Police Station, an officer pulls out a bundle of files. Out of it comes a single photograph: a young woman holding a small child. That face is So-ran's. And those photographs go into an envelope, ready to be sent to Sato.

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Today's Answer

Let's put the answer together. Why did Sato stop at Keum Seo-hee? I see three layers.

One: the surname. Keum is rare, and of all people, it's the same surname as the gunman from Kyeam-ri. And that gunman turned down every other interpreter and asked only for Keum Seo-hee.

Two: Kyeam-ri. For Sato, Kyeam-ri is a past he erased, going as far as changing his name. And Keum Seo-hee is right beside the foreign reporter who could bring that past back to life.

Three: the name itself. Keum Seo-hee is the name of the child Sato killed in Kyeam-ri thirteen years ago. And the file on its way up from Suwon holds a photograph of that child's mother, holding her. The moment Sato opens it, the interpreter trainee using a dead child's name and Yoo Philip's Chinese wife connect in a single line.

So here's today's answer. The fake name that used to protect Ga-kyung has now become a gun pointed at her. The name So-ran gave her to remember her daughter is, for Sato, a name that summons back the past he wiped away.

The Episode 7 Preview and Our Picks

So what happens in episode 7? Let's take the preview apart. In front of Sato, Hideo says of Ga-kyung that Keum Seo-hee is actually a pretty decent person. But Sato's orders point the other way: "Check everything in Keum Seo-hee's personnel file, her whole past history too."

Then there's a moment where Ga-kyung discovers something and murmurs, could it be Kyeam-ri? And at the end of the preview, Ga-kyung hides whatever is in her hand behind her back, and Hideo asks what she's holding.

Gordon Insight Picks

All right, here are my three Gordon Insight picks.

Pick one. In episode 7, Sato recognizes that the woman in the photo is So-ran. And at that moment he'll become almost certain that Keum Seo-hee is a fake.

Pick two. What Ga-kyung hides behind her back in the preview is that very family photo from Suwon. If the mention of a family photo in the preview refers to this picture, then Ga-kyung gets her hands on it before Sato does.

Pick three. This time, Hideo sides with Ga-kyung, not his father. Because of this line of his in the preview: "That man should have had a lawful trial." Hideo didn't just let Seok-jung's death slide. He's Korean by birth too, and he's already fooled his father once while interpreting.

What's your prediction? Will Sato open that file first, or will Hideo learn Ga-kyung's secret first?

The month Ga-kyung was promised, and the lie hiding behind that promise. I have a feeling episode 7 is where the whole board gets flipped. I'll break down the next episode as soon as it airs, too.

Sources

Real history

• The Jeam-ri massacre in Suwon, April 1919, and the court-martial acquittal of the Japanese army lieutenant who commanded it — 한국민족문화대백과 (Encyclopedia of Korean Culture) · 경인일보 (Kyeongin Ilbo)
• Schofield's report on the massacre — 경기일보 (Kyeonggi Ilbo)
• Photographs: Jeam-ri (1919), taken by Frank Schofield — Wikimedia Commons (public domain) · Schofield and Syngman Rhee (1958) — 국가기록원 (National Archives of Korea)
• Documents and plates: Henry Chung, The Case of Korea (Fleming H. Revell, 1921), pp. 232–233 — Internet Archive (Library of Congress copy)

The drama

• tvN weekend drama 100 Days of Deception, episode 6 (aired 2026-10-25) · official episode 7 preview (tvN DRAMA official channel)

Scene stills and dialogue in this post are quoted for the purpose of criticism and review; copyright belongs to the respective rights holders.