Seasons & Episodes
The Emperor's Lost Gold
After a botched operation puts Hae-sung and his team in serious jeopardy, the only way for him to salvage his career at
Spooky Stories
Hae-sung comes dangerously close to blowing his cover while searching for the hidden gold in Byeongmun High School's eer
Ghost Story Riddles
Hae-sung uncovers a crucial clue hidden within the old building, but Chairwoman Seo quickly learns its potential connect
Joining the Student Council
Hae-sung attends the anti-bullying committee session with a key witness who clears his name, while Dong-min finally find
Student Council
Hae Seong and the team grow increasingly concerned that Su A's suspicions could threaten his undercover mission. However
Hye Seong's Father's Notebook
The school's security guard dies, leaving Hae Seong a notebook belonging to his missing father. The revelation is shocki
The 24th Anniversary of Byeongmun High School
Hae Seong is caught off guard when he recognises Su A's childhood name, Bong Ja, which stirs memories of his first love
The Plan for VIP Students
After uncovering the possibility of a mole within the NIS, Hae Seong becomes increasingly distrustful of those around hi
The Mathematics Teacher
As Su A recovers in the hospital following the attack during the break-in, Hae Seong and the team uncover the culprit: L
Retribution
To everyone's shock, Seo Myeong Ju returns to the school. Unimpressed by Hae Seong, she expels him and demonstrates her
The Devastating Truth
The gold bars vanish just as they are within reach, and Seo Myeong Ju suspects Hae Seong has them. In the vault, Hae Seo
Where The Stars Lead
Despite getting badly injured, Hae Seong manages to call Su A and his team. They conclude that the only evidence they ca
Popular Cast
