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

as Call Center Agent

Kim Mi-ri

as Call Center Agent

Kim Soo-yeon

as Call Center Agent

Kim Chae-won

as Call Center Agent

Kim Hye-yoon

as Call Center Agent

Park Hyeon-yeong

as Call Center Agent

Park Hyeon-ha

as Call Center Agent

Baek Seo-yeon

as Call Center Agent

Son Jin-joo

as Call Center Agent

Yang Ah-reum

as Call Center Agent

Yang Yeon-hee

as Call Center Agent

Yoon So-hee

as Call Center Agent

Yoon Ye-hyeon

as Call Center Agent

Lee Se-min

as Call Center Agent

Lee Soo-bin

as Call Center Agent

Lee Yoo-song

as Call Center Agent

Lee Han

as Call Center Agent

Im Jin-kyeong

as Call Center Agent

Jin Min-jeong

as Call Center Agent

Choi Ha-won

as Call Center Agent

Park Gun-joo

as Tae-joon's Bullying Colleague

Kwon Joon-yeol

as Tae-joon's Factory Colleague

Cha Woo-young

as Tae-joon's Factory Colleague

Lee Seung-yeong

as Tae-joon's Factory Colleague

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

as Security Guard

Jeon Jeong-hoon

as Security Guard

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

as Trainee

Chae-seul

as Trainee

Go Eun-seon

as Chaperone Teacher

Kang Seo-hoo

as Child Going to School

Kwon Hae-rin

as Child Going to School

Bae Seo-eun

as Child Going to School

Seo Hyo-won

as Child Going to School

Seo Jae-hee

as Child Going to School

Lee Eun-gyoo

as Child Going to School

Kim Ki-hyun

as Dong-ho's Factory Colleague

Kim Jae-beom

as Dong-ho's Factory Colleague

Kim Jong-hak

as Dong-ho's Factory Colleague

Nam Yoon-gi

as Dong-ho's Factory Colleague

Seo Sang-woo

as Dong-ho's Factory Colleague

Heo Geon-haeng

as Dong-ho's Factory Colleague

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

as Police Station Staff

Kim Han-saem

as Detective Bae's Stand-In

Moon Seong-ryeol

as Customer Seo Jang-woo (voice)