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)