Woo Ji-hyun

Yoo Jung-tae

Kang Jae-hak

Jung-woo – High school teacher who discovers his fiancée is cheating with a friend.

Bang

Im Jeong Yun

Ryu Sachimoto (Japanese: 幸本龍, Hepburn: Sachimoto Ryū)

Choi Taek-gyun

Cha Jae-kyung: Su-an's older brother, who is working as a homicide detective.

Seon-woo

Wang Jung-jin

Gu Dong-gu, a prison guard and Ba-reum and Chi Kook's friend. He was in the same class with Ba-reum and Chi-guk at a private academy.

Wie Goo-pyung

A rookie in the police station (Ep. 16)

Bae Jin-hwan

Choi Bong-gi (Joseph)

Jeon Jin-man