Park Ye-jin
— Hong-joo
Baek Yoon-sik
— Baek-jung
Ryu Deok-hwan
— Hong-je
Oh Dal-su
— Professor Kim Sang-chul / Professor Oh Byung-seok
데니 안
— Kang Seung-wan
박영서
— Yong-yi
Woo Hyun
— Mr. Park
Choi Jae-sub
— Teaching Assistant Lim Hee-cheol
Kwak Do-won
— Senior Jeong
Baek Jae-ho
— Detetctive Kim
Jang Joon-nyeong-I
— Detective Park
Jang So-yeon
— Baek-jung's wife
