The drama "Undercover High School" expressed a heartfelt connection towards Seo Kang-jun and Jin Ki-joo.

In the episode aired on the 21st of MBC’s Friday-Saturday drama "Undercover High School," Jeong Hae-sung (Seo Kang-jun) and Oh Soo-ah (Jin Ki-joo) created an unusual atmosphere.

On that day, Jeong Hae-sung found the collapsed Oh Soo-ah, who had been stabbed, and rushed her to the hospital. After the surgery, he stayed by Oh Soo-ah's bedside and blamed himself, saying, "I'm sorry. I'm sorry for not being able to protect you." At that time, Oh Soo-ah, who opened her eyes, smiled and said, "If you're so sorry, treat me well." Jeong Hae-sung replied, "Are you okay? I was worried. I'm glad." In response, Oh Soo-ah revealed that the perpetrator of the school grade scandal was fellow teacher Lee Joon-ho (No Jong-hyun).

At the same time, Jeong Hae-sung discovered that the identity of the assailant was also Lee Joon-ho. Oh Soo-ah was shocked, and Jeong Hae-sung returned home and thought about why Lee Joon-ho had broken in. As a result, he realized that the target was his father’s notebook and was convinced that Seo Myeong-joo (Kim Shin-rok) was behind it.

At the same moment, Seo Myeong-joo obtained Jeong Hae-sung's notebook from Lee Joon-ho and tried to get a hint about the last ghost story from it but failed. Later, he attempted to eliminate Lee Joon-ho through Principal Park Jae-moon (Park Jin-woo), but this also failed with regard to Jeong Hae-sung.

In the meantime, Jeong Hae-sung had suspected that Team Leader An (Jeon Bae-soo) might be Seo Myeong-joo's accomplice. After clearing up the misunderstanding, Jeong Hae-sung shed tears of regret and told Team Leader An, "I will fulfill the mission of Agent Jeong Jae-hyun from 22 years ago. I will find everything. The gold bullion and my father too."

Following Lee Joon-ho's confession, Principal Park Jae-moon was arrested on charges of attempted murder, and Seo Myeong-joo was apprehended for grade scandals and conspiracy to murder. As a result, the identity of Seo Myeong-joo's accomplice was revealed. It was Director Kim (Lee Seo-hwan). When he appeared in the interrogation room, he said to Seo Myeong-joo, "The situation doesn't look good. It seems like the business related to the board chairperson's educational city is also out of reach" and asked, "Is there any alternative to overcome the current situation?"

When Seo Myeong-joo didn't say anything, Director Kim attempted to distance himself by saying, "There’s no alternative, and there’s no way to uphold our promise. Then this will be the end for us. I know a skilled lawyer who can write a letter of reflection." Seo Myeong-joo responded with a laugh, saying, "How far do you think a madwoman who has lost everything will go, without fear?"

Meanwhile, Jeong Hae-sung attended school as usual and focused on uncovering the last ghost story. Lee Dong-min (Shin Jun-hang) caught attention by saying, "It sounds ridiculous, but they say there's a curse on the school. The person who knows the last ghost story will experience a vanishing phenomenon. They say they'll disappear without a trace, suddenly one day."

In a peaceful moment, Seo Myeong-joo and Principal Park Jae-moon reappeared at the school, shocking everyone. Standing in front of a surprised Oh Soo-ah, Seo Myeong-joo said, "I heard the story. They say you almost died. We need to be extra careful from now on." Jeong Hae-sung was also surprised and rushed over, to which Seo Myeong-joo remarked, "We’re running into each other often these days," and then said, "But what's to be done? The student playtime ends here," as she tore off her name tag.

At the end of the video, the preview depicted Jeong Hae-sung, who was expelled from school, resuming his duties with the National Intelligence Service. While engrossed in the search for the gold bullion with Seo Myeong-joo, Jeong Hae-sung confessed to Oh Soo-ah, "I like you. A lot." This raised curiosity about the development of the plot.

[Photo] Capture from the broadcast of "Undercover High School"

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