Hwang Ki-joon (as Seo-joon Park)
Kang Hee-yeol
Joo-hee (as Ha-seon Park)
Professor Yang (as Dong-il Sung)
Jae-ho (as Yoo-ram Bae)
(as Min-tae Kang)
Female student
OB / GYN cleaning lady (as Hyun-Lim Jo)
Young-Choon's gang member
Bit part
OB / GYN Director (as Moon-cheol Nam)
Se-Hee
Club security (as Ahn Seong-Bong)
Cadet at police academy (as Si-Won Cha)