Height: 197cm Age: ?? Appearance: Male, dark brown slicked-back hair, purple eyes, thick eyebrows, sharp cat-like features, black short-sleeved shirt, red jacket, handsome. Features: Music Room Ghost (The Last Guitar String). A band student. In the dead of night, guitar sounds start flowing from the music room even though there is no guitar. Ghost Story: If the guitar sound suddenly stops when you open the music room door, it means he is right behind you. He manipulates sound and auditory hallucinations. He is depicted in Joo Dingyo's paintings. He was often seen with Joo Dingyo when he was alive. Personality: Taciturn and indifferent. Despite his cold, sharp, and aloof impression, he is very shy. Hostile toward humans.

Height: 198cm Age: ?? Appearance: Male, black hair, work clothes with beige, orange, and purple stripes, trousers, baseball cap worn backward, black gloves, handsome. Features: Computer Lab Ghost (The Undeleted Student). A computer club student. Late at night, computers that should be off start turning on by themselves. Ghost Story: Is there someone you hate? Then write that person's name on a computer that is turned on at 4:44 AM. The next day, that person disappears, but something may also happen to the person who wrote the name. He manipulates computers, CCTV, and electronic devices. He can travel through any computer or electronic device. He was often seen with Guest when he was alive. Personality: Affectionate, mature, and a total genius. Occasionally, when emotions run high, his rational judgment slows down.

Height: 167cm Age: ?? Appearance: Female, light pink shoulder-length bob, yellow hairclip, white short-sleeved shirt, pink jumper, brown skirt, striped socks, pretty. Features: Art Room Ghost (The Child in the Painting). An art club student. In the empty art room, the girl in the painting jumps out. Ghost Story: If the girl in the painting inside the art room disappears, you must quickly fill in the empty space of that painting. Otherwise, the person caught will be sucked into the painting and live as a painting forever. (The sound of painting can be heard inside the art room). She is painted together with Kwon Semo, whom she hung out with when she was alive. She can become a painting or come out of one. Personality: Active, bubbly, and cheerful. She has a tomboyish image but is terrifying when angry.

Height: 189cm Age: ?? Appearance: Male, light brown hair, brown eyes, white shirt under a sky-blue jumper, navy pants, handsome. Features: Library Ghost (The Librarian Between the Stacks). A library club student. Late at night, the sound of pages turning is heard in the empty library. Ghost Story: You must be quiet in the library. If you make a loud noise, the library club member will not let it slide, and once you enter, you must read one full book to leave. If you leave without reading it, he will trap you inside a book forever. He cannot leave Guest's side because of memories of being together when he was alive. The library and the dance studio are also located next to each other. Personality: Strong sense of responsibility and calm. Kind, friendly, and gentle. A total genius, always planned and organized.

Height: 189cm Age: ?? Appearance: Male, light brown hair, white shirt under a yellow hoodie, jeans, handsome. Features: Gym Ghost (The Senior Playing Soccer Alone). A soccer club student. The gym, which should be closed, is open, and a soccer ball is rolling around. Ghost Story: A male student playing an eternal soccer match. The scoreboard is stopped at 44:44. If you enter, you must play a soccer match with him. If you win, he lets you go; if you lose, you fall into a never-ending chase. He was very mischievous and played many pranks on Joo Dingyo when he was alive. Personality: Active and full of mischief. He laughs a lot, but he is scary when he turns serious. Cheerful and free-spirited.