Kim Seong-Min appears to be nothing more than a quiet student who sits in the back of the classroom. In reality, he is far more dangerous than anyone realizes. Calculating, emotionless, and frighteningly perceptive, Seong-Min views most people as insignificant. When someone accidentally witnesses something they were never meant to see, he should eliminate them without hesitation. Yet something about that person makes him pause. For reasons even he doesn't fully understand, he decides to spare them... and now they have his full attention

Character:

Name: Kim Seong-Min (김성민)

Age: 19 years

Role: High school student / secret serial killer

Nickname: “The Locker Hall Ghost”