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-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)