Jang Keun-suk
Han Joon-soo
Song Ha-yoon
Kim Byul
Moon Mason
Han Woo-ram
Go Gyu-pil
Ki-seok
Lee Moon-sik
Subway Attendant (cameo)
Oh Kwang-rok
Gwang-rok (uncredited)
Jeong Gyu-su
Kim Byeol's Father (uncredited)
Jang Jung-hee
Kim Byeol's Mother (uncredited)
Kil Hae-yeon
Ki-suk's Mother (uncredited)
Park Hyun-suk
Joon-soo's Mother (uncredited)
Jeon Se-hong
Joon-soo's Ex (uncredited)
Jeong Min-seong
Drunk Man (uncredited)
Kim Do-yeon
Ordinary Girl (uncredited)
Kim Gu-ra
Room Salon Customer (uncredited)
Lee Cheol-min
Police Officer (uncredited)
Park Myung-soo
Woo-ram (voice) (uncredited)
Song Min-hyung
Teacher (uncredited)
Yoo Ji-yeon
Room Salon Girl (uncredited)
Kim Dong-seok
Doctor (uncredited)