"A female detective investigates the cause of a high school girl’s death and uncovers a disturbing truth."
Kim Si-eun
as So-hee
Bae Doona
as Yoo-jin
Jung Hoe-ryn
as Jun-hee
Kang Hyun-oh
as Tae-joon
Bahk Woo-young
as Dong-ho
Lee In-young
as Eun-ah
Park Hui-eun
as So-hee's Mother
Kim Yong-jun
as So-hee's Father
Sim Hee-seop
as Former Team Manager
Yoon Ga-i
as Ji-won
Jung Soo-ha
as Jung-in / Customer Oh Joo-yeon (voice)
Park Yoon-hee
as Director
Choi Hee-jin
as Newcomer Team Manager
Yoo Jeong-ho
as Head Manager
Moon Jung-woong
as Headquarters Staff 1 / Customer Choi Cheol-woong (voice)
Kim Tae-yoon
as Headquarters Staff 2
Yoo Jae-won
as Call Center Colleague Yoo-jeong
Kim Hee-won
as Call Center Colleague Seon-ae
Park Seo-kyoung
as Call Center Colleague Park Seul-ki
Kim Woo-kyum
as Detective Bae
Kim Tae-woong
as Detective Kim / Customer Yoon Won-sang (voice)
Song Yo-sep
as Chief of Criminal Division
Na Jong-min
as Chief of Police Station
Heo Jeong-do
as Homeroom Teacher
Park Soo-young
as Vice Principal
Kwon Da-ham
as Chief of Staff
Hwang Jeong-min
as School Vice-Commissioner
Han Hye-ji
as Former Team Manager's Wife
Sim Ji-an
as Former Team Manager's Son
Eom Ok-ran
as Bar Owner
Kim Soo-yeong
as Practice Room Member Soo-yeong
Lee Hwa-young
as Practice Room Member Hwa-young
Yoo Jae-yeon
as Practice Room Member Jae-yeon
Cho Yu-jin
as Practice Room Member Min-ji
Lee Ji-ho
as Practice Room Member Ji-ho
Jang Eun-jeong
as Practice Room Member Eun-jeong
Lee Jong-min
as Gopchang Restaurant Man
Oh Joong-hoon
as Call Center Guide Staff
Na Won-hee
as New Colleague Myeong-kyeong / Customer Koo Min-seo (voice)
Jo Ha-min
as New Colleague Eun-hwa
Kang Hee-min
as Call Center Agent / Customer Lee Joo-bin (voice)
Ko Ha-eun
as Call Center Agent
Kim Do-yeon
Kim Mi-ri
Kim Soo-yeon
Kim Chae-won
Kim Hye-yoon
Park Hyeon-yeong
Park Hyeon-ha
Baek Seo-yeon
Son Jin-joo
Yang Ah-reum
Yang Yeon-hee
Yoon So-hee
Yoon Ye-hyeon
Lee Se-min
Lee Soo-bin
Lee Yoo-song
Lee Han
Im Jin-kyeong
Jin Min-jeong
Choi Ha-won
Park Gun-joo
as Tae-joon's Bullying Colleague
Kwon Joon-yeol
as Tae-joon's Factory Colleague
Cha Woo-young
Lee Seung-yeong
Yoo Yong-hee
as Parking Lot Security Guard
Lee Yoon-ji
as Female Employee on Her Way to Work
Min Jae-won
as Security Guard
Sin Ho-yeon
Jeon Jeong-hoon
Park Hyeon-gook
as Human and Net Staff
Park Seong-woong
as Forensic Examiner
Jang In-tae
as Funeral Staff
Lee Chae-yeong
as Redhead Trainee
Son Yoo-jin
as Trainee
Ahn So-jeong
Chae-seul
Go Eun-seon
as Chaperone Teacher
Kang Seo-hoo
as Child Going to School
Kwon Hae-rin
Bae Seo-eun
Seo Hyo-won
Seo Jae-hee
Lee Eun-gyoo
Kim Ki-hyun
as Dong-ho's Factory Colleague
Kim Jae-beom
Kim Jong-hak
Nam Yoon-gi
Seo Sang-woo
Heo Geon-haeng
Gal Jae-yoon
as Funeral Director
Kim Jin-yeong
as Technical Team Staff / Customer Cho Sang-wook (voice) / Customer Jeong Doo-wan (voice)
Na Ye-eun
as Jun-hee's Fan
Kim Ye-na
as Police Station Staff
Chu Eun-kyeong
Kim Han-saem
as Detective Bae's Stand-In
Moon Seong-ryeol
as Customer Seo Jang-woo (voice)
Choi Im
Production Design
Lee Young-lim
Editor
Jeong Min-ju
Sound
Kim Dong-ha
Producer
Kim Il-yeon
Director of Photography
Han Ji-youn
Kim Min-jae
Lighting Director
Kim Ha-kyoung
Costume Design
Jeong Seong-uk
VFX Supervisor
Hong Jang-pyo
Special Effects Supervisor
Hwang Jung-ho
Sound Supervisor
Kim Kyu-man
Sound Mixer
Choi Kwang-rak
Martial Arts Choreographer
July Jung
Director
Writer
Kim So-ryeong
Storyboard
Eom Tae-sik
Digital Colorist
Kim Hye-jeong
Boom Operator
O Chang-ryeol
Makeup & Hair
Kim Ji-yeon
Kim Cha-i
Jang Young-gyu
Original Music Composer
Matt Dugan
Executive Consultant
Kim Han-ul
Assistant Director
Choi Pyung-ho
Executive Producer
Yun-gyeong Kim
Sound Effects Editor
