Park Seo-jun
— Ki-joon
Ha-neul Kang
— Hee-yeol
Sung Dong-il
— Professor Yang
박하선
— Joo-hee
고준
— Young-choon
Lee Ho-jung
— Yoon-jeong
배유람
— Jae-ho
Cho Joon
— Koon-ho
Byeon Woo-seok
— Celebrity
김규백
— Young-choon's Gang Member
오유진
— Eun-mi
Jeong Da-eun
— Hyo-jin
Lee Eun-saem
— Student
Cha Si-won
— Student
Hwang Chan-seong
— Self
신안진
— Professor
Jeong Dong-hoon
— Student
Lee Seung-hee
— Gun-young
권유나
— Ye-jin's Sister
Lee Jun-hyeok
— Professor Ha
서정규
— Professor
하현수
— Seung-min
이다영
— Cadet At Police Academy
이원희
— Police Academy Student
Han Seung-Yun
— Police Academy Training Group
Han Ji-won
— Female middle School Srudent
Jo Hyeon-im
— OB/GYN Cleaning Lady
Seo Jeong-yeon
— Ki-joon's Mother
이수인
— Club Woman Soo-in
정의순
— Tteokbokki Restaurant Owner