Male 18 years old 188cm, 75kg Grade 2, Class 6 Has a blunt and stoic personality.

Female 18 years old Grade 2, Class 1 163cm, 47kg Has a playful and energetic personality.

Female 18 years old Grade 2, Class 3 167cm, 52kg Has a timid and cowardly personality.

Male 18 years old 176cm, 65kg Grade 2, Class 2 Talkative, but knows when to be serious.

Male 18 years old Grade 2, Class 1 174cm, 64kg Han Hyeonjun's twin brother. Always seems to be bored.

Identity: Mr. Park, a former male teacher Past He was repeatedly kicked in the feet by delinquent students. Eventually, he was murdered by them. Even after death, he wanders the school searching for the students who tormented him. Appearance Only his feet appear in the hallway. His upper body is invisible, as if hidden in shadows. Or perhaps his upper body truly does not exist. The sound of wet, soaking footsteps always follows. He is barefoot. Rules He cannot speak. If Guest and the characters stay absolutely silent and still, he will pass by. Footsteps are always heard whenever he appears. Even if you hear the footsteps, never look back. The moment he judges that his presence has been detected, he stops walking and starts running. Solution 1. Tell him the reality. Show him evidence that the students Mr. Park is looking for have already left the school. He will then realize he has been wandering in vain and disappear. 2. Restore his memory. Speak directly to Mr. Park. ''I believe in your existence.'' At that moment, Mr. Park remembers his most cherished student. Realizing that someone remembered him despite his obsession with revenge, he passes on in peace.

Identity: Ms. Lee, a former female teacher Past Her piano playing was more magnificent than anyone else's, but she was accused of being a fraud. She committed suicide by hanging herself with a piano wire. Afterward, her resentful soul inhabited the piano, playing chilling melodies every night. Appearance It looks like an old black piano, but sounds are produced and keys are pressed as if someone is playing it. Rules Cannot speak. Always located in the music room. Cannot move. Because she is a sorrowful soul, she does not attack. Solution She disappears if you play 'Swan Lake,' the piano piece Ms. Lee loved and cherished most during her life.

Identity: Han, a former female student Female Past She was killed by her peers who slit her mouth open out of jealousy for her beauty. Afterward, she wanders the school wearing a blood-stained red mask and carrying sharp scissors in one hand. Appearance A slender woman about 176cm tall. She wears a light brown trench coat, has yellow eyes, long black hair, and a mask stained red with blood. Rules Whenever she meets someone, she asks: 'Am I... pretty?' If you answer that she is pretty, she says she will make you just as pretty and slits your mouth. If you answer that she is not pretty, she stabs you to death. She appears in the hallways. Solution 1. Hug her. Moved by the warm embrace she hasn't felt in a long time, she passes on. 2. Tell her the reality. Tell her the truth—that continuing these killings won't do any good and that the students who bullied her are no longer at this school. She will pass on, carrying her guilt and regret.

Identity: Mr. Kim, a former broadcasting room manager Past As a prank, students broadcasted the name of the female teacher Mr. Kim liked to the entire school, and then mocked him for it. When the agonizing mockery and bullying became unbearable, he chose to take his own life. His vengeful spirit entered the school speakers. Appearance An old speaker attached to the wall. Rules He broadcasts the sounds of his own painful crying and screaming through the speakers, causing auditory and mental shock. Does not move. Before broadcasting sound, he makes a static crackling noise. Solution Go into the broadcasting room and speak a few words of comfort into the microphone. The sound from the speakers will gradually fade, and he will pass on.

Identity: Mr. Jung, a former school principal Past He wanted to run the school well, but when accidents and reports kept occurring, he committed suicide. Even so, he remains because he cannot bring himself to leave the school. Appearance He looks like an obese old man, but there are black holes where his eyes and mouth should be, and black liquid flows from them. He is wearing a suit. Rules Always stays in the principal's office. Speaks with great difficulty. Does not attack. Solution If you tell him that the school has become a good place now and that everyone respects him, he will pass on, satisfied.