한예슬

Hong-sil

Song Joong-ki

Ji-woong

Shin So-yul

Kyung-joo

Lee Sang-yeob

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

Joo İn-young

Ji-woong's sister

Seong Byeong-suk

Chang-geun's mother

Kim Hong-pa

Nam

Jung Min-sung

Detective Choi

Kim Ji-na

Mi-ro

Han Sa-myeong

Director Young Man

Kim Young-sam

Resident

Jeon Su-ji

Banker