Jang Keun-suk
Han Joon-soo

Song Ha-yoon
Kim Byul

Moon Mason
Han Woo-ram

Ko Kyu-phil
Ki-seok

Lee Moon-sik
Subway Attendant (cameo)

Oh Kwang-rok
Gwang-rok (uncredited)

Jeong Gyu-su
Kim Byeol's Father (uncredited)

Kil Hae-yeon
Ki-suk's Mother (uncredited)

Park Hyun-suk
Joon-soo's Mother (uncredited)

Jeon Se-hyun
Joon-soo's Ex (uncredited)

Jeong Min-sung
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)