Jang Keun-suk

Character: Han Joon-soo

Song Ha-yoon

Character: Kim Byul

Moon Mason

Character: Han Woo-ram

Ko Kyu-phil

Character: Ki-seok

Lee Moon-sik

Character: Subway Attendant (cameo)

Oh Kwang-rok

Character: Gwang-rok (uncredited)

Jeong Gyu-su

Character: Kim Byeol's Father (uncredited)

Jang Jung-hee

Character: Kim Byeol's Mother (uncredited)

Kil Hae-yeon

Character: Ki-suk's Mother (uncredited)

Park Hyun-suk

Character: Joon-soo's Mother (uncredited)

Jeon Se-hyun

Character: Joon-soo's Ex (uncredited)

Jeong Min-sung

Character: Drunk Man (uncredited)

Kim Do-yeon

Character: Ordinary Girl (uncredited)

Kim Gu-ra

Character: Room Salon Customer (uncredited)

Lee Cheol-min

Character: Police Officer (uncredited)

Park Myung-soo

Character: Woo-ram (voice) (uncredited)

Song Min-hyung

Character: Teacher (uncredited)

Yoo Ji-yeon

Character: Room Salon Girl (uncredited)

Kim Dong-seok

Character: Doctor (uncredited)