Kang-ho Song

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

Kim Sun-young

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

Jang Hye-min

Babybox Staff 2

Jeong Jong-yeol

Babybox Pastor

Jung Ah-young

Jung-ae

Lee Ye-seo

Ye-seo

최희진

Mi-sook

Lee Do-goon

Police Officer

Kim Do-yeon

Seon-ah

최효상

Doctor

Kang Min-ji

Nurse 1

이가경

Nurse 2

Yang Gwon-seok

Taxi Driver

이두석

Gyu-seok

Yoon Sang-hak

Granny in front of the Laundromat

Lee Do-gyoo

4-Year-Old Woo-sung

Lee Yoo-joo

Little Girl at So-young's House 1

Kang Gyoo-rin

Little Girl at So-young's House 2

Kim Joo-eun

Little Girl at So-young's House 3

Lim Ga-Young

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

Woo Sung-min

Orphanage Kid 1

Choi Yoon-woo

Orphanage Kid 2

Jung Hyuk

Teenager 1

Lee Dong-hyeon

Teenager 2

Kim Yoon-ho

Teenager 3

Kim Do-yeop

Teenager 4

Song Ji-ho

Teenager 5

Kim Soo-ji

Teenager 6

Park Jong-hyeon

Detective 1

Jeon Sun-ho

Ji-yeong

Park Yeong-joon

Orphanage Staff

Hwang Do-yoon

Babybox Baby 1

Kim Da-na

Babybox Baby 2

Kim Soo-hyeon

Babybox Baby 3

Bae Ga-jin

Babybox Nanny 1

Kim Jin-ah

Babybox Nanny 2

Son Yeong-ok

Sang-hyun's Mother

Jeong Myeong-yeon

Sang-hyun's Wife

Sin Chae-rin

Young Yun-ah

Park Geon-woo

Young Dong-soo

Choi Gi-sang

First Director of the Orphanage

Park Byeong-gwan

Second Director of the Orphanage

Na Gyeong-cheol

News Anchor (voice)

Lee Ga-eun

Subway Announcement (voice)