Undercover High School – K-drama Episode 4 Recap & Review
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Undercover High School – K-drama Episode 4 Recap & Review

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Written By Dr Tool
Published Feb 11, 2026
Read Time 7 Min
Views 426

Episode 4

Episode 4 of Undercover High School begins with Hae-seong looking for Gu Sang-tae, the owner of the gambling ring. He takes care of all the goons and knocks Sang-tae out. Young-hoon, Seok-ho and Mi-jung arrive to help him and Seok-ho berates Hae-seong for not telling them about the bullying issue. He tells Hae-seong that they are a team and he should lean on them.

Hae-seong takes Sang-tae to the school’s anti-bullying committee. Sang-tae confesses the whole thing and says Tae-soo is a VIP member who owes him money. He would bring him ID cards as payment instead. Hae-seong lists all of Tae-soo’s crimes and this time, Dong-min speaks up. Hae-seong then offers a flash drive with CCTV footage that proves Tae-soo’s connection with Sang-tae.

Later, Myeong-ju tells Tae-soo’s father that she will have to expel Tae-soo because of his involvement in a criminal case. Tae-soo’s father tries to threaten her but it doesn’t work and on Myeong-ju’s behalf, Principal Park starts beating him up. She later tells Park they should speed up the process of looking for the gold bars.

Soo-a later tells Hae-seong that Tae-soo has been expelled. He thanks her for uploading the online post. As he picks a petal off her hair, Soo-a’s heart begins to flutter.

We then dive into the second ghost story. It follows a young student who always came second to her best friend, who ranked first. In a fit of jealousy, she pushed her friend off the roof to her death. Later, when the girl was studying at school alone, the clock chimed and then she was haunted by a ghost with red eyes.

Dong-min narrates this to Hae-seong. He says there are four stories in total but no one knows the fourth. They eat at Hae-seong’s team’s sandwich shop and Hae-seong pretends to be a part-time worker there.

Elsewhere, Ye-na and Yoo-jung go shopping and Yoo-jung carries all her shopping bags. She realises that Ye-na is interested in Hae-seong.

Meanwhile, Oh Soo-a keeps thinking about her fluttering heart. She recalls the boy from her childhood as well. When the vice principal catches her sleeping at her desk, Soo-a ends up becoming the advisory teacher for the student council.

Hae-seong tries to open the grandfather clock again but fails. Yoo-jung arrives and puts a poster for student council recruitment on the noticeboard. While helping her put pictures up, Hae-seong realises there is a twin grandfather clock in the room where the student council has its meetings. Ye-na happens to see Yoo-jung and Hae-seong putting the pictures and looks suspicious.

When Hae-seong tries to enter the room, Ye-na advises him to become a student council member. She gives him the expensive gift she bought and he berates her for wasting her money and tells her to spend it on workbooks instead.

Hae-seong then approaches Soo-a and asks her what it takes to qualify as a student council member. She tells him he needs to rank 10th or higher in his last exam, get 100 reference signatures, and get permission from the student council president (Ye-na).

Hae-seong then finds that Dong-min is now friends with Tae-soo’s two lackeys. Turns out, they both apologised to him and allowed him to hit them with a bat. They now try to help Hae-seong get more signatures but fail at it. Things look difficult as Hae-seong’s grades are low and the midterms are in a week.

One day, Hae-seong arrives at school to see that his team members have put on free food stalls and a dance performance to get him 100 signatures. In the student council, Ye-na seems eager for Hae-seong to join while one of the other members calls him a traitor for chasing Tae-soo out. Ye-na is surprised to hear that Yoo-jung doesn’t want him to join.

Yoo-jung then meets Hae-seong on the roof and adamantly tells him to stay away from the student council. She even threatens to reveal his real identity. Hae-seong tries to speak to her afterwards but she doesn’t respond.

Meanwhile, Myeong-ju tells Principal Park to keep an eye on Hae-seong and the clocks. Ye-na comes by and greets both of them. After Park leaves, Myeong-ju tells Ye-na to study hard and even gives her ADHD medicine to focus. She tells Ye-na she has to rank first to be remembered.

The next morning, Hae-seong gets a call for a one-day military training (since they aren’t aware he is on a covert mission). He calls Soo-a and tells her he is down with a cold and needs some time off. Later that night, Soo-a calls him and says she’s coming over with medicine.

But Seok-ho and his team haven’t set up Hae-seong’s house at the fake address yet. They rush over and end up borrowing objects and necessities from the neighbouring houses to make the empty unit look like a home.

Soo-a arrives and the three team members hide in the closet. She gives Hae-seong some porridge but he spills it on her, forcing her to use the bathroom. She’s about to leave when she trips and falls, bringing Hae-seong down with her and landing both of them in an unintentional kiss.

At the same time, Young-hoon is trying to keep in a sneeze inside the closet. Mi-jung kisses him to stop him from doing so but that only makes him swoon and fall out of the closet, exposing all of them to Soo-a.

Undercover High School Episode 4’s final scene shows Soo-a going through a photo album. She finds a photo of her and another little boy from school. It is none other than Si-hyun (Hae-seong when he was a child). Back then, her name was Bong-ja and the memory shows her telling Si-hyun to eat his peas.

The Episode Review

Undercover High School Episode 4 brings the focus back on Hae-seong’s mission and we see him vie for a seat on the student council. The reasoning for this is frail at best, seeing as there are surely different ways to get to the clock inside the student council room, particularly considering Seok-ho gave Hae-seong a device that could pick any lock.

But it is still amusing to see an NIS agent being forced to dance for student votes and be stunned by his low grades. A twist that makes this more interesting is Yoo-jung’s adamant objection against Hae-seong. It could just be her embarrassment at her subjugation around Ye-na and the others, but could there be something more?

With Tae-soo out of the picture, there is a shift from the focus on bullying. The resolution of the Tae-soo issue feels apt. However, it seems a bit too easy for Dong-min to forgive the two boys who enabled all of Tae-soo’s actions. The good thing is that this leaves space for more of the show’s comedy, general silliness and Seo Kang-joon’s great comic timing.

Dr Tool

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