김동욱

Sung-seok

고성희

Hae-joo

황보라

Mi-yeon

김의성

Chang-gyu

임예진

Hae-joo's mother

Yum Jung-ah

Mrs. Chun

한수현

Hae-joo's eldest brother

이채은

Oh Hye-jin

조우진

Mr. Seo

강신철

Lee Jae-young

손지현

Kim Shin-a

Kim Sun-young

Cho Su-jung

Yoo Seung-mok

Coach

이준혁

Photographer

민무제

Hae-joo's second brother

Cha Rae-hyoung

Hae-joo's youngest brother

정우성

Traffic police (cameo)

Lee Jung-jae

Lawyer (cameo)

조윤희

Bae Mi-ra