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