Actor Shin Hyun-jun embarks on a search for his high school senior year homeroom teacher from 40 years ago, the person who changed his life and helped him reach his current position as a 36-year veteran actor.

On the upcoming episode of Channel A's variety show 'Detectives' Trade Secrets' (hereafter 'Tam-bi'), airing on the 20th, a special client, Shin Hyun-jun, will appear in the 'Detectives 24 Hours' segment. He expresses his earnest desire to meet the teacher who guided him onto the path of acting.

During his school years, Shin Hyun-jun advanced to Yonsei University's Department of Physical Education after winning a tennis tournament and working as a cover model for a tennis magazine, but he always harbored a passion for film. When he saw the audition notice for director Im Kwon-taek's film 'General's Son' for new actors, he was hesitating until a warm word of encouragement from his senior year homeroom teacher gave him courage. He ultimately made his successful debut in the 1990 film 'General's Son' in the role of Hayashi.

The homeroom teacher, who was in their late 30s to early 40s at the time, is estimated to be in their 80s now. Shin Hyun-jun expressed his feelings of sorrow, saying, "When I think of the teacher's age, I feel worried. I just hope they are alive."

In this episode, the MCs' own school day memories are also revealed. Kim Poong shared that he was deeply hurt when his third-grade elementary school homeroom teacher told his parents, 'Poong has no talent for art, so I wish he would learn to draw.' However, he belatedly expressed his gratitude, saying that this experience actually motivated him to attend an art academy, and he eventually succeeded as a webtoon artist.

Defconn also recalled a memory of his sixth-grade elementary school homeroom teacher telling his parents, 'Dae-jun is a spinning top. You have to hit it for it to spin. You have to discipline him.' He stated that thanks to his parents raising him strictly like a spinning top, he was able to reach his current position, crediting it all to his teacher.

Meanwhile, in this episode, Kim Min-soo of the comedy crew 'Psick University,' which boasts 2.83 million subscribers and 3.2 billion cumulative views, joins as a one-day detective. Kim Min-soo brought up his 'Mountain Climbing Club President Kim Young-nam' character and shouted his signature catchphrase, "I said let's eat baeksuk! Passion! Passion! Passion!" heating up the atmosphere on set.

Furthermore, regarding the leadership of ideas within the team, Kim Min-soo issued a provocative challenge to Jung Jae-hyung and Lee Yong-joo, stating, "I am 80 percent of Psick University." In response, Defconn fired back, saying, "If you want to refute that, come on 'Tam-bi'," drawing laughter from the crowd.

Episode 120 of 'Detectives' Trade Secrets,' featuring the touching story of 'the teacher who changed my life' and Kim Min-soo's activities, will air on Monday, July 20th at 10 p.m.