cast
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Kim Si-eun
So-hee
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Bae Doona
Yoo-jin
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Jung Hoe-ryn
Jun-hee
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Kang Hyun-oh
Tae-joon
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Bahk Woo-young
Dong-ho
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Lee In-young
Eun-ah
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Park Hui-eun
So-hee's Mother
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Kim Yong-jun
So-hee's Father
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Sim Hee-seop
Former Team Manager
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Yoon Ga-i
Ji-won
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Jung Soo-ha
Jung-in / Customer Oh Joo-yeon (voice)
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Park Yoon-hee
Director
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Choi Hee-jin
Newcomer Team Manager
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Yoo Jeong-ho
Head Manager
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Moon Jung-woong
Headquarters Staff 1 / Customer Choi Cheol-woong (voice)
- Kim Tae-yoon Headquarters Staff 2
- Yoo Jae-won Call Center Colleague Yoo-jeong
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Kim Hee-won
Call Center Colleague Seon-ae
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Park Seo-kyoung
Call Center Colleague Park Seul-ki
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Kim Woo-kyum
Detective Bae
- Kim Tae-woong Detective Kim / Customer Yoon Won-sang (voice)
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Song Yo-sep
Chief of Criminal Division
- Na Jong-min Chief of Police Station
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Heo Jeong-do
Homeroom Teacher
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Park Soo-young
Vice Principal
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Kwon Da-ham
Chief of Staff
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Hwang Jeong-min
School Vice-Commissioner
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Han Hye-ji
Former Team Manager's Wife
- Sim Ji-an Former Team Manager's Son
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Eom Ok-ran
Bar Owner
- Kim Soo-yeong Practice Room Member Soo-yeong
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Lee Hwa-young
Practice Room Member Hwa-young
- Yoo Jae-yeon Practice Room Member Jae-yeon
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Cho Yu-jin
Practice Room Member Min-ji
- Lee Ji-ho Practice Room Member Ji-ho
- Jang Eun-jeong Practice Room Member Eun-jeong
- Lee Jong-min Gopchang Restaurant Man
- Oh Joong-hoon Call Center Guide Staff
- Na Won-hee New Colleague Myeong-kyeong / Customer Koo Min-seo (voice)
- Jo Ha-min New Colleague Eun-hwa
- Kang Hee-min Call Center Agent / Customer Lee Joo-bin (voice)
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Ko Ha-eun
Call Center Agent
- Kim Do-yeon Call Center Agent
- Kim Mi-ri Call Center Agent
- Kim Soo-yeon Call Center Agent
- Kim Chae-won Call Center Agent
- Kim Hye-yoon Call Center Agent
- Park Hyeon-yeong Call Center Agent
- Park Hyeon-ha Call Center Agent
- Baek Seo-yeon Call Center Agent
- Son Jin-joo Call Center Agent
- Yang Ah-reum Call Center Agent
- Yang Yeon-hee Call Center Agent
- Yoon So-hee Call Center Agent
- Yoon Ye-hyeon Call Center Agent
- Lee Se-min Call Center Agent
- Lee Soo-bin Call Center Agent
- Lee Yoo-song Call Center Agent
- Lee Han Call Center Agent
- Im Jin-kyeong Call Center Agent
- Jin Min-jeong Call Center Agent
- Choi Ha-won Call Center Agent
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Park Gun-joo
Tae-joon's Bullying Colleague
- Kwon Joon-yeol Tae-joon's Factory Colleague
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Cha Woo-young
Tae-joon's Factory Colleague
- Lee Seung-yeong Tae-joon's Factory Colleague
- Yoo Yong-hee Parking Lot Security Guard
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Lee Yoon-ji
Female Employee on Her Way to Work
- Min Jae-won Security Guard
- Sin Ho-yeon Security Guard
- Jeon Jeong-hoon Security Guard
- Park Hyeon-gook Human and Net Staff
- Park Seong-woong Forensic Examiner
- Jang In-tae Funeral Staff
- Lee Chae-yeong Redhead Trainee
- Son Yoo-jin Trainee
- Ahn So-jeong Trainee
- Chae-seul Trainee
- Go Eun-seon Chaperone Teacher
- Kang Seo-hoo Child Going to School
- Kwon Hae-rin Child Going to School
- Bae Seo-eun Child Going to School
- Seo Hyo-won Child Going to School
- Seo Jae-hee Child Going to School
- Lee Eun-gyoo Child Going to School
- Kim Ki-hyun Dong-ho's Factory Colleague
- Kim Jae-beom Dong-ho's Factory Colleague
- Kim Jong-hak Dong-ho's Factory Colleague
- Nam Yoon-gi Dong-ho's Factory Colleague
- Seo Sang-woo Dong-ho's Factory Colleague
- Heo Geon-haeng Dong-ho's Factory Colleague
- Gal Jae-yoon Funeral Director
- Kim Jin-yeong Technical Team Staff / Customer Cho Sang-wook (voice) / Customer Jeong Doo-wan (voice)
- Na Ye-eun Jun-hee's Fan
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Kim Ye-na
Police Station Staff
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Chu Eun-kyeong
Police Station Staff
- Kim Han-saem Detective Bae's Stand-In
- Moon Seong-ryeol Customer Seo Jang-woo (voice)