The Clue

Yoo Seung-ho

as

Han Jung-hoon

Kang So-ra

as

Lee Da-jung

Park Cheol-min

as

Crazy

Jeong Seok-yong

as

Kang Kuk-man

Lee Yeong-jin

as

Yoon Sang-mi

Jo Yoon-hee

as

Hong Joo-hee (...

Min Kyung-jin

as

Principal

Im Soo-hyang

as

Im Soo-hyang (...

Kim Ji-eun

as

Student

Jung Young-ki

as

Student

Kim Young-woong

as

History Teacher