During fourth period, high schooler Da-jeong finds his 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.

Starring:

In-sook Choi, Soo-hyang Im, Chi-yong Ahn, Jae-sang Han

Genre:

Drama, Korean, Mystery