Composer
Director
Screenwriter
Main Role
- Kim Sun AhCha Woo Kyung [Child counselor]Main Role
- Lee Yi KyungKang Ji Heon [Detective]Main Role
- Nam Gyu RiJeon Soo YeongMain Role
- Cha Hak YeonLee Eun Ho [Worker at Haneul Children's Center]Main Role
Support Role
- Joo Seok TaeYoon Tae Joo [Psychiatrist]Support Role
- Na Young HeeHeo Jin Ok [Woo Kyung's mother]Support Role
- Yeon Je HyungKwon Chan Wook [Police officer]Support Role
- Park Soo Young Support Role
- Oh Hye WonCha Se Kyung [Woo Kyung's sister]Support Role
- Joo Ye RimKim Eun Seo [Woo Kyung's daughter]Support Role
- Kim Yeo JinKim Dong Seok [So Ra's mother]Support Role
- Ha Eun SooLee Yeon Joo [Ji Heon's ex-girlfriend / Min Seok's mistress]Support Role
- Baek Hyun Jin Support Role
- Lee Hae OnHa NaSupport Role
- Kang Mal Geum[Shi Wan's mother]Support Role
- Kim Kang HoonHan Shi Wan [Child sheltered at Haneul Children's center]Support Role
- Kim Bup RaeSong Ho Min [Head of Haneul Children's Center]Support Role
- Chae Yoo RiCha Se Kyung [Woo Kyung's real sister / Girl in green dress]Support Role
- Yoo Eun MiLee Bit NaSupport Role
- Lee Hwa Ryong[Autopsy doctor]Support Role
- Hwang In JoonAhn Seok WonSupport Role
- Kim Young JaeKim Min Seok [Woo Kyung's husband]Support Role
- Choi Yoo SongMin Ha JungSupport Role
- Choi Yoon WooHan SolSupport Role
- Kim Ji EunMin JooSupport Role
- Shin Hee ChulLee Jun MoSupport Role
- Park Yoo MilLee Yi KyungSupport Role
- Kim Hyun Woo[kid]Support Role
- Kim Do YoungPark Yong TaeSupport Role
Guest Role
- Lee Han SeoSo Ra [Dong Seok's daughter]Guest Role
- Seo Yi SooJung Hee Soo [Seok Woo's sister]Guest Role
- Ha Joo HeePark Ji Hye [Ex-convict]Guest Role
- Kim Seung HanJung Seok Woo [car accident victim]Guest Role
- Moon Ye WonChoi Mi SunGuest Role
- Park Geon Rak[Lawyer]Guest Role
- Ham Na YoungCha U Gyeong [Child]Guest Role
- Kim So YeonCha Woo Kyeong [teen]Guest Role
- Seo Kwang Jae[Cha Se Kyung's Doctor]Guest Role
- Lee Yoon Sang[Haneul Children Center's board member]Guest Role
- Kwon Yee EunHallucinationGuest Role
- Park Seo KyungJung Rim [Young]Guest Role
- Shin Woo Gyum[Soo Yeong's older brother]Guest Role
- Seo Hye Jin[Kindergarten teacher]Guest Role
- Na Seok Min[Police officer]Guest Role
- Kim Yeon Seo[Girl]Guest Role
- Park Jin Young[Medical examiner]Guest Role
- Park Joon MokKim Min Ki (Ep. 14)Guest Role
- Bae Yoo Ri Guest Role
- Kim Na In Guest Role
- Kim Ha Neul Guest Role
- Kim Mo Bum Guest Role
- Han Ji Eun[Group mom]Guest Role
- Kim Joo Ah[Woman meeting Woo Kyung]Guest Role
- Min Seo YoungYoung Sun [Young]Guest Role
- Park Shi Wan Guest Role
- Kwon Chan Min[Police officer]Guest Role
Bit part
- Shin Ji Yeon[Prisoner]Bit part
- Kim Hae Won[Private tutor]Bit part
Unknown
- Oh Soo Hyun Unknown
- Oh Seung Chan Unknown
- Jeong Ye Dam Unknown
- Im Ho Joon Unknown
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