- Kim Seon-a
- Chun Jae-in
- Gong Yoo
- No-young
- Nam Sang-mi
- Seung-hee
- Ha Jung-woo
- Detective Cho
- Park Sang-myun
- Class teacher
- No Joo-hyeon
- Detective Chun
- Kim Kap-su
- Cha Young-jae
- Lee Beom-su
- Detective working on maths exam
- Jeong Byeong-cheol
- (as Byeong-cheol Jeong)
- Oh Gwang-Rok
- Bae Doo-sang
- Kim Sang-ho
- Detective Kang