The Regular Tardy Student

Kim Seung-ho

Jang Seong-hak

Hwang Jeong-sun

Mrs. Gwacheon

Jeon Young-sun

Suk-jan

Kim Seok-hun

Gab-jun

Kim Wun-ha

Eul-jun

Choi Ji-hee

Bae-yeong

Heo Chang-kang

Hwang Hae-san

Lee Kwang-ho

Byeong-jun

Kim In-seon

Kid

Kim Chil-seong

Chief Detective

Jeong Ae-ran

Mrs. Choi

Ju Seon-tae

Executive Director Ju

Dokgo Sung

Bae-yeong's Brother

Lee Ye-min

Kim Su-i