한예슬

Hong-sil

Song Joong-ki

Ji-woong

신소율

Kyung-joo

이상엽

Gwan-woo

Lee Jae-won

Tae-woo

이용주

Chang-geun

김동현

Hong-sil's father

문세윤

Sysop

Ra Mi-ran

Landlady

Park Hye-jin

Ji-woong's mother

주인영

Ji-woong's sister

Seong Byeong-suk

Chang-geun's mother

김홍파

Nam

정민성

Detective Choi

Kim Ji-na

Mi-ro

한사명

Director Young Man

Kim Young-sam

Resident

전수지

Banker