Notes from the Last Row Episode 4 Review: "Episode 4" — Jeong-hu Threatens Se-yun, Kang Finds the CCTV Letter, and Eun-joo Walks Into the Park

By Mira Vance · Editor & Lead Reviewer

Episode 4 turns Se-yun's phone confession into the season's ugliest family argument, then watches Mun-oh and Kang decide which vulnerable person can be pushed next. The hour braids the Kim house, where Min-hui's funeral is handled like a reputational leak, with Mun-oh's marriage, where Hyeon-suk finally says what his seriousness has cost her. By the time the hospital CCTV letter reaches Su-hun, investigation has become pressure: everyone wants the truth, but almost no one wants to protect the person who might break under it.

Kang rewinds Se-yun’s collapse, and Su-hun turns Min-hui’s funeral into another managed family problem

The episode opens on Se-yun telling Jeong-hu the line Episode 3 ended on, then immediately makes Kang and Mun-oh do the less dramatic work. Kang insists he is not inventing from nothing; he used deduction, checked the torn-up pages in Se-yun’s trash, and watched his friend turn into someone who hides in his room and snaps at the idea of coding.

The family dinner gives that collapse a cleaner shape. Eun-joo worries because Se-yun is not eating. Su-hun treats the room like a mood to manage. When Eun-joo mentions Min-hui’s braised short ribs, Su-hun asks why she would bring Min-hui up, and the whole table has to remember that the dead woman was not only labor, gossip, and scandal. She cooked food the family misses.

Then the funeral conversation does what this show does best: it lets kindness and control share the same plate. Eun-joo explains that Min-hui’s father has washed his hands of her, that her sister is dead, that the church might raise money for the funeral and for Eun-seo. Su-hun blocks the fundraiser, not because people would disapprove, he says, but because people would talk too long. He will pay. The less they talk, the easier she’ll rest sounds generous until you hear the quiet command inside it.

Se-yun thanks him and leaves the table. Kang’s read is cruder and probably closer to the bone: rotten hypocrite. Mun-oh’s is colder. Watching Se-yun from campus, he starts hoping the boy is hiding something because Su-hun’s own child might finally have evidence against him.

Kang brings Mun-oh camera proof from Jae-sik, admits he envied Se-yun, and gets told to listen through Jeong-hu

The Jae-sik favor gives Kang enough camera proof for Mun-oh to change his instructions. Whatever the footage shows, it makes Mun-oh comfortable with Kang looking into what Se-yun has been hiding. That phrase is the tell. Mun-oh is no longer pretending he wants a neutral account of Min-hui’s death. He wants an opening.

Kang, unexpectedly, is the one who hesitates. He tells Mun-oh he liked knowing Mr. Kim was nowhere near his good-guy image because it brought Se-yun’s perfect life down a notch. That is an ugly confession, and the episode lets it stay ugly. Kang wanted his friend’s house to crack because the intact version made his own lack feel worse.

Now he has seen the pain inside that crack. He wishes Se-yun did not have to suffer because Se-yun is his friend. Mun-oh takes that little moral pulse and converts it into a task. The truth will help Se-yun. The truth will set him free. It may hurt like ripping a Band-Aid off your soul, but Kang should be brave and do it for him.

That is Mun-oh’s gift as a teacher and his danger as a man. He can make trespass sound like duty in under a minute.

The opportunity is Jeong-hu. She is coming home for Su-hun’s birthday, and Kang knows Se-yun worships his sister. Mun-oh tells him to arrange himself close enough to see and hear when the siblings are alone. The last row has become portable. It can be a classroom, a hotel hallway, a family house, or anywhere a lonely boy can pretend listening is friendship.

Jeong-hu comes home for Su-hun’s birthday, and Kang hears the siblings name the affair

Jeong-hu’s arrival is disarmingly normal at first. She asks about her father’s whereabouts, learns he has gone to Min-hui’s funeral on his own birthday, and gives Se-yun the kind of teasing older-sister roughhousing that briefly makes the house look like the one Kang first wanted to enter.

Kang waits for the private room and gets exactly what Mun-oh sent him to get. Jeong-hu knows about the affair. She calls Min-hui Su-hun’s mistress, asks how Eun-joo could be so blind when it was happening under her own roof, and says their mother should know about Min-hui and all the other women Su-hun has used as muses.

Se-yun’s answer is not defense of his father. It is fear for his mother. He says Eun-joo never had to find out the way they did. He remembers bringing her medication whenever she was upset and the day she tried to kill herself. He and Jeong-hu arrive at a grim little sibling treaty: protect their mother first, protect the image second, and keep the affair buried because the truth might damage the person least equipped to hear it.

The birthday setting makes it nastier. Su-hun is away paying for Min-hui’s funeral, Eun-joo is downstairs asking Kang what to write on a homemade cake, and the children are upstairs deciding how much of their father’s ugliness their mother can survive. The family is full of rituals meant to prove love. None of them can make the house honest.

Se-yun says Min-hui survived the accident, and Jeong-hu answers murder with a threat

Then Se-yun changes the case. Min-hui did not die at the hotel, he says. She survived the accident. He followed them to the hospital in secret, and whatever he saw there is what made him call Jeong-hu in terror.

The show is careful here, and the review has to be careful with it. Se-yun says his father murdered Min-hui. He says he saw it. Jeong-hu says he saw nothing, that he is sleep-deprived from games, that a cheating bastard is not automatically a murderer. The hour does not give us the hospital footage yet. It gives us a brother insisting and a sister deciding what that insistence would cost her.

Jeong-hu does the math fast. An affair would cause a scandal. Murder would destroy Su-hun’s reputation and the name she is making for herself. She asks whether Kang knows, then seems relieved that Se-yun has kept quiet.

Then the old bond breaks in one sentence. Jeong-hu tells him to keep his mouth shut or she will end him. The sister he worshipped becomes the person threatening to erase him for naming what he thinks he saw. Afterward, Se-yun shuts himself in his room and will not come out to say goodbye.

Kang brings the whole thing back to Mun-oh shaken, and for a second the professor almost sounds human about it. They have a potential murder, death threats, and no proof. Then the story-brain resumes. Se-yun is acting different. Jeong-hu has betrayed him. Maybe that broken bond can be used.

Kang tries to use Eun-joo, and Mun-oh’s old history slips out in one first name

Kang’s next proposal is the episode’s clearest ethical line, and Mun-oh actually sees it. Kang wants to exploit Se-yun’s bond with his mother. Drop tiny hints around Eun-joo, make her ask questions, let her pressure Se-yun into speaking, and listen from nearby when the family pain starts producing usable material.

Mun-oh shuts it down because Se-yun is afraid Eun-joo might hurt herself again. He understands, or at least says he understands, what it would mean to turn a mother’s old suicide attempt into leverage. Kang hears something else: Mun-oh calls her Eun-joo.

That one first name does more damage than a confession would. Kang immediately wonders whether there is history, and Mun-oh overcorrects so hard he confirms the wound. They knew each other in college, not well, different years, nothing to see here. It is the least convincing denial he has given all season, which is saying something for a man who stole contest questions and keeps pretending his lessons are educational.

Outside Kang’s draft, Mun-oh’s own life starts fraying around the same name. He forgets an Academic Society paper, lies to Hyeon-suk about ending the lessons, and later talks in his sleep to Eun-joo as if she is still the person at the center of the room. Hyeon-suk, who has been trying to turn one thawed bedroom into a marriage, hears enough to know the house is cold again.

Her apology makes it worse. She says she was cruel to compare him to Su-hun, that she knows how badly he suffered when he could not write. Mun-oh cannot even accept the apology without making it another wound. Then Kang sends the picture that yanks him back to the story he has chosen over his wife.

A fan letter reaches Su-hun at home, and Kang follows the 10 p.m. park appointment without permission

The letter arrives at the Kim house with no return address, and Su-hun tries to turn it into an old-fashioned fan note. Older readers still send mail, he says. They think it is romantic. Kang is close enough to see that Su-hun is rattled, and close enough to photograph the contents: someone claims to have hospital CCTV footage and orders a 10 p.m. meeting at Central Fountain in Seongchang Park.

Mun-oh and Kang make the logical leap together. If the letter is real, the footage is incriminating. Mun-oh calls it an attempt to blackmail Se-yun. The obvious suspect is Se-yun himself because he followed them to the hospital and has been staring at his father like a man who has made a decision.

At dinner, Su-hun tries to clear the house with a movie, ice cream, a drive, anything that gets his family away from the 10 p.m. appointment. He claims a last-minute work thing. Se-yun says he has a group project at the same hour. Eun-joo, still trying to make a birthday evening out of pizza and care, gets left between two men lying in different directions.

Kang does not wait for homework. He goes to the park because the meeting place is in the letter and tells Mun-oh only after he is already there. Mun-oh objects to the process, not the act. Kang says he remembered the objective: help his friend. Mun-oh allows it this once, tells him to call no matter how late, and gives the old instruction in a new form. Stay hidden. Do not let them know you are there.

Hyeon-suk catches Mun-oh lying, and Kang returns with the wrong blackmailer: Ahn Eun-joo

Hyeon-suk hears enough of that phone call to stop pretending. Mun-oh is still mentoring Kang. Whatever they are doing sounds suspicious. He calls it a serious endeavor, which is exactly the kind of sentence that proves her point before she has to make it.

Her fight with him does not need the murder plot to be frightening. She is a marriage counselor who gives people communication homework and comes home to a man who shares nothing but a roof. She supported him, endured him, waited years for him to show he cared, and kept burying what hurt until she says she buried herself.

Mun-oh answers by calling her a whining child.

That is the whole marriage in one cut: she finally names the afterthought she has become, and he reduces it to noise because Kang might be near a fountain with the next piece of Su-hun. The show does not have to punish him immediately. It lets the silence after that line do the work.

Kang does not call. Mun-oh panics, dials again, imagines the boy doing exactly what he told him not to do. He is right. Kang bursts in shouting that the meeting was more twisted than they thought because he chased the figure through the park and tried to confront him as Se-yun. The person turns around.

It is not Se-yun. It is Ahn Eun-joo.

Mun-oh repeats the name once, then again. Kang’s blackmail case has landed on the woman Mun-oh never stopped carrying around. If Eun-joo wrote the letter, then the wife everyone has been protecting from the truth may already be closer to it than they are. His final question says the quiet possessiveness out loud: My Eun-joo?

Tiny details worth clocking

• Su-hun paying for Min-hui’s funeral is both useful and chilling. He prevents a fundraiser, prevents talk, and gets to look generous while controlling the timetable.
• Kang’s envy confession is one of his cleanest moments. He does not excuse wanting Se-yun’s perfect life brought down; he admits the pleasure before admitting the guilt.
• Jeong-hu’s threat uses the same family-protection logic as Se-yun’s silence, just with all the tenderness stripped out.
• Eun-joo’s birthday cake sits beside the blackmail letter beautifully: one handmade object meant to preserve the family, one mailed object meant to break it open.
• Hyeon-suk’s counseling language turns against her marriage. The advice she gives clients is exactly what Mun-oh refuses to practice at home.

Final verdict

Episode 4 is less clean than Episode 3, mostly because the middle stretch has to move a lot of hidden information without showing the hospital event itself. The Academic Society reminder, Mun-oh’s Eun-joo fixation, Su-hun’s birthday outing, the anonymous letter, and Kang’s park surveillance all arrive quickly, and the machinery is visible in places.

The machinery keeps producing human cost. Su-hun manages a funeral like a press problem. Jeong-hu turns family loyalty into a gag order. Kang tries to make concern for Se-yun justify eavesdropping on a mother with a history of self-harm. Mun-oh, faced with all of that, keeps choosing the story and then acts offended when Hyeon-suk notices he has chosen it over her.

Hyeon-suk’s argument does more for the hour than the park reveal. It anchors the story in a room far away from the Kim house: writing, investigation, reputation, even marriage can all become serious endeavors for people who refuse ordinary care. Mun-oh wants truth from everyone else’s family while lying inside his own. That is why Eun-joo’s appearance at the fountain lands. The woman he has turned into memory, motive, and maybe muse is not waiting inside his version of the past. She is out in the story, acting for reasons he does not yet own.

Rating: 8.8/10 — a dense, nervy hour with a slightly crowded setup, but excellent pressure on how evidence becomes leverage and how Mun-oh’s old obsession keeps damaging the living people beside him.

More episodes from Notes from the Last Row — A campus novel turns into accusation, obsession, and evidence. Jump to any episode in the season:

Reviewed by Mira Vance · QuizFandom Editor & Lead Reviewer. Every rating is an honest per-watch assessment from the desk that also writes the quizzes — not a press release rehash.

← All Notes from the Last Row reviews