| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Henry Lau | Crew | Sound | Theme Song Performance | 32 |
 Roy Kim | Crew | Sound | Theme Song Performance | 32 |
 Oh Choong-hwan | Crew | Directing | Director | 32 |
 Bae Suzy | Crew | Sound | Theme Song Performance | 32 |
 Kang Min-kyung | Crew | Sound | Theme Song Performance | 32 |
 Park Hye-ryun | Crew | Writing | Screenplay, Creator | 32 |
 Lee Hae-ri | Crew | Sound | Theme Song Performance | 32 |
Oh Choong-hwan | Crew | Creator | Creator | |
Park Se-jun | Crew | Sound | Music | 32 |
 Son Byung-ho | Cast | Actor | President Go | 3 |
 Lee Ki-young | Cast | Actor | Park Dae-young | 32 |
 Kim Ki-cheon | Cast | Actor | Lee Hwan's father | 5 |
 Jeon Kuk-hwan | Cast | Actor | Soo Kyung's father | 5 |
 Jang Hyun-sung | Cast | Actor | Jung Il Seung | 4 |
 Lee Jae-won | Cast | Actor | Jo Yoon Pyo [Phone Buyer] | 4 |
 Lee Sang-yeob | Cast | Actor | Lee Yoo-beom | 32 |
 Kim So-hyun | Cast | Actress | Park So Yoon | 8 |
 Min Sung-wook | Cast | Actor | Lee Ji-gwang | 32 |
 Ryu Tae-ho | Cast | Actor | Professor Moon Tae Min | 4 |
 Kim Won-hae | Cast | Actor | Choi Dam-dong | 32 |
 Choi Won-young | Cast | Actor | Nam Chul Doo [Hong Joo's father] | 2 |
 Nam Da-reum | Cast | Actor | Young Jeong Jae-chan | 32 |
 Park Jin-joo | Cast | Actress | Moon Hyang-mi | 32 |
 Kang Shin-hyo | Cast | Actor | Gyoo Won | 1 |
 Hwang Young-hee | Cast | Actress | Yoon Moon-seon | 32 |
 Ko Sung-hee | Cast | Actress | Shin Hee-min | 32 |
 Moon Yong-seok | Cast | Actor | Lee Hwan [Tae Min's student] | 4 |
 Oh Eui-sik | Cast | Actor | Bong Doo-hyeon | 32 |
 Jung Hae-in | Cast | Actor | Han Woo-tak | 32 |
 Shin Jae-ha | Cast | Actor | Jeong Seung-won | 32 |
 Lee Jung-eun | Cast | Actress | Jae Chan's mother | 2 |
 Kang Ki-young | Cast | Actor | Kang Dae Hee | 5 |
 Yoon Kyun-sang | Cast | Actor | Lovers | 1 |
 Lee Sung-kyoung | Cast | Actress | Lovers | 1 |
 Yeo Hoi-hyeon | Cast | Actor | Lee Yu Beom [Young] | 2 |
 Lee Jae-kyoon | Cast | Actor | Choi Dam-dong | 32 |
 Baek Sung-hyun | Cast | Actor | Do Hak Young [Cable Man] | 8 |
 Jang So-yeon | Cast | Actress | Do Geum Sook [So Yoon's mother] | 6 |
 Lee Jong-suk | Cast | Actor | Jeong Jae-chan | 32 |
 Uhm Hyo-seop | Cast | Actor | Park Jun Mo [So Yoon's father] | 5 |
 Shin Eun-jung | Cast | Actress | Kim Joo Young | 2 |
 Lee Yoo-jun | Cast | Actor | Oh Gyeong-han | 32 |
Bae Suzy | Cast | Actress | Nam Hong-joo | 32 |
 Lee Na-ra | Cast | Actress | Ha Joo An [IV Drip Serial Killer] | 3 |
 Go Woo-rim | Cast | Actor | Young Jeong Seung-won / Chan-ho | 32 |
 Kim Da-ye | Cast | Actress | Kang Cho Hee [Dae Hee's sister / Barista] | 9 |
 Cho Mi-nyeo | Cast | Actress | Ji Kwang's Paralegal | 4 |
 Pyo Ye-jin | Cast | Actress | Cha Yeo-jeong | 32 |
 Bae Hae-seon | Cast | Actress | Son Woo-joo | 32 |
 Hong Kyung | Cast | Actor | Choi Wook Hyeon [Deserter] | 5 |
 Cha Jung-won | Cast | Actress | Yoo Soo Kyung [Archer] | 4 |
 Son San | Cast | Actress | Min Jeong-hee | 32 |
 Lee Do-gyeom | Cast | Actor | Myeong Dae-goo | 32 |
 Lee Bong-ryeon | Cast | Actress | Go Pil-sook | 32 |
 Yoo In-soo | Cast | Actor | Seung Won's classmate | 3 |
 Park Young-soo | Cast | Actor | Car salesman | 1 |
 Shim Wan-jun | Cast | Actor | Man with mustache | 1 |
 Lee Ga-ryeong | Cast | Actress | Hospital Coordinator | 1 |
 Kim Su-in | Cast | Actress | Thief's daughter | 1 |
 Jo Yeon-ho | Cast | Actor | Im Se Young [Witness] | 2 |
 Kim Do-Hye | Cast | Actress | Kindergartner | 1 |
 Lee Min-jae | Cast | Actor | Seung Won's classmate | 3 |
 Hong Hee-won | Cast | Actor | Doctor Expert Witness | 2 |
 Woo Sung-min | Cast | Actor | Kindergartner | 1 |
Jeong Hyun-seok | Cast | Actor | Chan Ho's doctor | 4 |
 Moon Ah-ram | Cast | Actress | Yu Beom's firm's receptionist | 6 |
| Person | Type | Job | Role(s) | Episodes |
