송강호

Sang-hyun

강동원

Dong-soo

배두나

Su-jin

IU

So-young

이주영

Detective Lee

Lim Seung-soo

Hae-jin

Park Ji-yong

Woo-sung

송새벽

Orphanage Director

김선영

Orphanage Director's wife

이무생

Seon-ho

이동휘

Mr. Song

김새벽

Song's Wife

백현진

Detective Choi

Oh Hee-jun

Choi's Subordinate

류경수

Tae-ho

Jong Ho

Young-gil

성유빈

Young-min

박강섭

Si-woo

김금순

Ms. Park

강길우

Mr. Im

김예은

Im's Wife

박해준

Mr. Yoon

Jung Ji-woo

Yoon's Wife

류지안

Yun-ah

Yun Seul

Babybox Staff 1

Jeong Jong-yeol

Babybox Pastor

Lee Ye-seo

Ye-seo

최희진

Mi-sook

Lee Do-goon

Police Officer

Kim Do-yeon

Seon-ah

최효상

Doctor

이가경

Nurse 2

이두석

Gyu-seok

Lim Ga-Young

19-Years-Old Girl at So-young's House

Woo Sung-min

Orphanage Kid 1

Choi Yoon-woo

Orphanage Kid 2

이동현

Teenager 2

Hwang Do-yoon

Babybox Baby 1