Seo Kang-joon got his hands on his missing father‘s notebook.

The 5th episode of MBC’s Friday-Saturday drama ‘Undercover High School’ (planned by Nam Goong-woo/written by Lim Young-bin/directed by Choi Jeong-in) depicted the story of Jung Hae-seong (played by Seo Kang-joon) struggling among those chasing his identity. The viewership ratings for that day were 7.2% nationwide by Nielsen Korea, and 7.0% in the metropolitan area. In particular, the epilogue scene where Soo-ah discovers Hae-seong‘s father Jung Jae-hyun (played by Oh Eui-sik) in an old collection of poems rose to 9.6%. In addition, the 2049 viewership rating, a key indicator that measures channel competitiveness and topicality, recorded 2.4%, garnering hot interest from viewers.

In the broadcast that day, Hae-seong succeeded in placing in the top 10 of the entire school, one of the conditions for becoming a student council officer. In addition, he tried to flirt with Lee Ye-na (played by Kim Min-joo), who had the authority to select officers, in order to avoid losing to other applicants, but the atmosphere quickly became tense, and even so, he was finally selected as a student council officer, which added to the fun.

On the other hand, Oh Soo-ah (played by Jin Ki-joo) constantly suspected Hae-sung, thinking back to what happened in the rooftop room. She even contacted the school to confirm before transferring, and mobilized her fellow teacher Kim Ri-an (played by Lee Min-ji) to keep an eye on the 4 domestic teams of the National Intelligence Service. It makes you wonder if Soo-ah will be able to figure out Hae-sung’s true identity with her persistent reasoning skills.

The subtle love triangle between Jung Hae-sung, Lee Ye-na, and Ahn Yoo-jung (played by Park Se-hyun) was also interesting. When Yoo-jung started avoiding him, Hae-sung approached her to mend their estranged relationship, and Ye-na, who watched this, began to care about the two. After that, Hae-sung and Yoo-jung had a meal together at Ye-na‘s suggestion. Haesung got angry when he saw Yena casually ordering Yoojung around and acting like a jerk while eating, and Yoojung also confessed everything to him, adding to the pity.

Meanwhile, a crisis that wasn’t a crisis befell Haesung when he went to the student council room at school to check the grandfather clock in the middle of the night. While Haesung was looking at the clock, he received a mysterious letter that said, “Nice to meet you. Agent Jeong Haesung.” After that, he couldn‘t let his guard down when he received a call from security guard Kim (played by Goo Min-hyuk) who found out his true identity and told him to meet him on the school rooftop.

At the end of the broadcast, an unexpected incident occurred, and an unpredictable development unfolded. At school, when it was midnight, the clock rang, and shortly after, just like in the second ghost story, Mr. Kim died, signaling the start of a truly mysterious incident. Also, the notebook of Jaehyun, Haesung’s father, was in his dead hand, confusing Haesung and raising expectations for the 6th episode.

Like this, the 5th episode of ‘Undercover High School’ was creepy because Mr. Kim, a security guard who knew his true identity, died right before Haesung was about to meet him. Today‘s episode is making viewers even more excited to see what kind of stories will be told related to this incident. ‘Undercover High School’ episode 6 will air on the 8th (today) at 9:50 p.m.

Jeon Hyo-jin, Donga.com reporter jhj@donga.com

This article is automatically translated using Google AI. If you notice any inaccuracies, please let us know at allkstar@donga.com.