It can be said that 'Undercover High School' is a video photobook of actor Seo Kang-joon, featuring a super-class drama with acting skills.

The second episode of the MBC Friday-Saturday drama 'Undercover High School' (planned by Namgoong Seong-woo, written by Lim Young-bin, directed by Choi Jeong-in, produced by Neo Entertainment and Slingshot Studio), aired on the 22nd, depicts the National Intelligence Service agent Jung Hae-sung (played by Seo Kang-joon) who infiltrated the school to overcome a trauma from his high school days in search of gold bullion worth 800 billion won.

Following his father's footsteps, Jung Hae-sung entered the National Intelligence Service. He had the obligation to find the hidden gold bullion worth 800 billion won related to Emperor Gojong in the hospital.

Nevertheless, he could not ignore Lee Dong-min (played by Shin Hang-jun), who was bullied and ignored by the powerful Park Tae-soo in his class. Though he was supposed to maintain a low profile as an agent, his brown eyes and the elegant yet fierce gaze reminiscent of a wolf ultimately led him to stand up for justice. In the process, he also faced off against his homeroom teacher Oh Soo-a (played by Jin Ki-joo), who, though seemingly soft like tofu, had a steel-like affection for her students.

Oh Soo-a misunderstood Jung Hae-sung, saying, 'You better be honest. Are you bullying Dong-min?' However, Jung Hae-sung replied, 'Oh, my head hurts,' explaining, 'The situation could be misunderstood. But it's really not the case.'

Meanwhile, when Jung Hae-sung was called to the counseling room after a fight with Park Tae-soo, Oh Soo-a said, 'Both of you were fighting. This can't be overlooked. If you started a fight, then call the teacher, or are you a thug? A delinquent? How long has it been since you transferred here that you're like this with the kids?' She did not hold back her harsh words. In response, Jung Hae-sung remarked, 'You really don’t know anything. Are you pretending not to know, or are you just inattentive? Teacher, do you care about the class at all?' He added, 'I’ll take it that Tae-soo acted well. If you really are just pretending not to know, it would be disappointing,' before turning away.

Oh Soo-a, feeling upset, said, 'Why did I want to become a homeroom teacher? Why do I have to hear those kinds of words?' and drank alone.

The mission was a mission. He seemed to have found the source of the gold bullion in the basement of the old ballet room. Equipped with a black hat, mask, and black clothing, he infiltrated the basement.

However, his outstanding physique as a National Intelligence Service agent, towering over 180 cm and built from sports and martial arts, could not be hidden even with a mask. It was so noticeable that even Lee Dong-min from the same class caught on. As they encountered a strange person in the basement, they managed to find a place where the materials regarding the gold bullion were stored. Jung Hae-sung concluded, 'Team leader, I think the chairman is also searching for the gold bullion.'

On the other hand, the looks of those who discovered the body entangled in the rumor felt shocked. Jung Hae-sung's remarkable appearance quickly swept away with shock and the judgment of the fact, and the face of Seo Myeong-joo (played by Kim Shin-rok), who was watching him, revealed an unknown scheme, enough to make viewers eager for the next episode.

[Photo] MBC Friday-Saturday drama 'Undercover High School'

[OSEN=Reporter Oh Se-jin]