In a late-night seance, the students of Grade 12 - Class 4 in Boseok Boys' High School discover the possibility of a ghost haunting their classroom....

Ye-dam's music demo gets tampered with an eerie paranormal noise. Hyun-suk carries out his ghost-hunting tactics and notices something weird about...

Asahi disproves his classmates' suspicions about him. Jung-hwan films a ghost-hunting vlog inside their classroom, much to Do-young's anxiety....

Desperate to satisfy his online followers, Jung-hwan resorts to secretly fabricating fake paranormal events and filming his classmates' reactions to...

Yoshinori discovers Haruto's identity through tarot card reading. At the spring festival, Class 4 fails to scare their customers in their haunted...

Jeong-woo is hospitalized after the school-wide paranormal event at the spring festival. Class 4 finds itself pointing fingers at each other....

Haruto reveals his sad tale to the students of Class 4. Do-young becomes resentful of Haruto after failing to obtain Mr. Ha's recommendation letter....

After confronting Haruto in fit of rage, Mr. Ha threatens to impose penalties on anyone who interacts with the ghost. Yoshinori's grandmother holds a...