4교시 추리영역
During fourth period, high schooler Da-jeong finds her classmate Tae-gyu dead in a classroom and Jeong-hun standing in front of him with blood on his clothes. In order to stop Jeong-hun from becoming the prime suspect, Da-jeong must help him find the real murderer, who is still inside the school building, under 40 minutes before period four ends.
- Zhanri: Crime, Mystery, Thriller, Action
- Studio: Sway Entertainment, Lotte Entertainment
- Fjalen:
- Cast: 유승호, 강소라, Sang-geun Jo, 정석용, Jeon Jun-hong, 이영진