Park Seo-jun

as Ki-joon

Kang Ha-neul

as Hee-yeol

Sung Dong-il

as Professor Yang

Park Ha-seon

as Joo-hee

Go Joon

as Young-choon

Lee Ho-jung

as Yoon-jeong

Bae Yu-ram

as Jae-ho

Cho Joon

as Koon-ho

Byeon Woo-seok

as Celebrity

Kim Kyu-baek

as Young-choon's Gang Member

Oh Yu-jin

as Eun-mi

Jeong Da-eun

as Hyo-jin

Lee Eun-saem

as Student

Cha Si-won

as Student

Hwang Chan-sung

as Self

Shin An-jin

as Professor

Jeong Dong-hoon

as Student

Lee Seung-hee

as Gun-young

Kwon You-na

as Ye-jin's Sister

Lee Jun-hyeok

as Professor Ha

Seo Jeong-gyu

as Professor

Ha Hyun-soo

as Seung-min

Lee Da-yeong

as Cadet At Police Academy

Lee Won-hee

as Police Academy Student

Han Seung-Yun

as Police Academy Training Group

Han Ji-won

as Female middle School Srudent

Jo Hyeon-im

as OB/GYN Cleaning Lady

Seo Jeong-yeon

as Ki-joon's Mother

Lee Soo-in

as Club Woman Soo-in

Jeong Eui-soon

as Tteokbokki Restaurant Owner

Lee Se-hee

as Se-hee

Choi Hong-il

as Hee-yeol's Father