Seo Kang-jun, who was caught for manipulating grades in 'Undercover High School', appeared at school again.

In the MBC Friday-Saturday drama 'Undercover High School' that aired on the 21st, the scene depicted Jeong Hae-sung (played by Seo Kang-jun) exposing the grade manipulation of Seo Myeong-joo (played by Kim Shin-rok).

On this day, Oh Su-a discovered signs of an intruder at Jeong Hae-sung's home and confronted an assailant. Oh Su-a asked, "Who are you? Why are you here?" and as she reached for her phone, the assailant threatened her with a knife, prompting her to attempt to escape. After a struggle, Oh Su-a was stabbed and collapsed, bleeding. Meanwhile, Jeong Hae-sung, who arrived home, found Oh Su-a and hurriedly said, "Su-a, stay awake. Su-a," as he rushed her to the hospital.

Later, Jeong Hae-sung apologized to Oh Su-a, who was lying in a hospital bed, saying, "I'm sorry. I'm sorry I couldn't protect you." At that moment, Oh Su-a regained consciousness and smiled, saying, "If you're really sorry, treat me better," and Jeong Hae-sung sighed in relief, saying, "Are you okay? I was worried. Thank goodness."

Oh Su-a then revealed to Jeong Hae-sung that the person behind the school's grade manipulation was Lee Joon-ho (played by Noh Jong-hyun). At the same time, Jeong Hae-sung learned via phone that Lee Joon-ho was the one who had been at his house. Jeong Hae-sung also discovered that Lee Joon-ho had stolen his father’s notebook from his home.

At that moment, Seo Myeong-joo (played by Kim Shin-rok), who had her hands on the notebook, was trying to get a hint about the final ghost story but was unsuccessful. Remembering Jeong Hae-sung's meaningful words from earlier, she fumed, "So the answer is only herself?".

Seo Myeong-joo attempted to eliminate Lee Joon-ho through Principal Park Jae-mun (played by Park Jin-woo) but failed due to Jeong Hae-sung. Jeong Hae-sung had been suspecting Team Leader Ahn (played by Jeon Bae-soo) all this time. He tested Team Leader Ahn on the pretext that he had Lee Joon-ho, but when he realized that Team Leader Ahn was not the traitor, he shed tears of relief.

Beginning with Lee Joon-ho's confession, Jeong Hae-sung exposed Seo Myeong-joo's grade manipulation scandal. Both Principal Park Jae-mun and Seo Myeong-joo were arrested by the police, and it was revealed that the informant was none other than Kim Guk-jang (played by Lee Seo-hwan) from the National Intelligence Service. As Kim Guk-jang tried to draw a line, Seo Myeong-joo laughed, saying, "How far can a madwoman who has lost everything go without fear?".

After reconciling the misunderstanding with Team Leader Ahn, Jeong Hae-sung vowed, "I will complete Agent Jeong Jae-hyun's mission from 22 years ago. I will find everything. Gold bullion and our father too."

The following day, Jeong Hae-sung tried to get a hint about the last ghost story from Lee Dong-min (played by Shin Jun-hang). Lee Dong-min said he didn't know but mentioned regarding the last ghost story, "It's nonsense, but they say there’s a curse on the school. The last person who knows the ghost story will experience a vanishing phenomenon. They say they’ll disappear without a trace one day suddenly.".

Meanwhile, due to the absence of Seo Myeong-joo, scholarship officers visited the hospital. However, among the scholarship officers, both Seo Myeong-joo and Principal Park Jae-mun appeared at school, surprising everyone. Seo Myeong-joo smiled at Oh Su-a, saying, "I heard the story. You almost died. From now on, you need to be extra careful.".

Startled by the news, Jeong Hae-sung came to the lobby, where Seo Myeong-joo said, "We seem to see each other often lately," and added, "But what can I say? The student game ends here," as she tore off Jeong Hae-sung’s name tag.

[Photo] 'Undercover High School' broadcast screen capture.

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