4th Period Mystery

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.

Cast

Yoo Seung-ho

Han Jung-hoon

Kang So-ra

Lee Da-jeong

Sang-geun Jo

Kim Tae-gyoo

Jeong Seok-yong

Kang Gook-man

Jeon Jun-hong

Embassy

Lee Yeong-jin

Yun Sang-mi

Kim Dong-beom

Do-il

Jo Yun-hei

Hong Ju-hee

Lee Chan-ho

Im Soo-hyang