Assistant Director
Director
Screenwriter
Main Role
- Yim Si Wan Main Role
- Shin Sae Kyeong Main Role
- Choi Soo Young Main Role
- Kang Tae Oh Main Role
Support Role
- Park Young GyuKi Jung Do [Seon Gyeom's father]Support Role
- Cha Hwa YunYook Ji Woo [Seon Gyeom's mother]Support Role
- Ryu AbelKi Eun Bi [Seon Gyeom's sister]Support Role
- Yeon Je WookJung Ji Hyun [Dan Ah's assistant]Support Role
- Lee Bong RyunPark Mae Yi [Mi Joo's friend]Support Role
- Lee Jung HaKim Woo Shik [Seon Gyeom's track team junior]Support Role
- Park Sung JoonKwon Young Il [Seon Gyeom's friend]Support Role
- Lee Hwang UiSeo Myung Pil [Dan Ah's father]Support Role
- Choi Jae HyunSeo Tae Woong [Dan Ah's step-brother]Support Role
- Lee Shin KiSeo Myung Min [Dan Ah's step-brother]Support Role
- Seo Jae HeeDong Kyung [Dann Agency's director]Support Role
- Kim Dong YoungGo Ye Joon [Young Hwa's friend]Support Role
- Kim Shi EunGo Ye Chan [Ye Joon's sister]Support Role
- Cha Bo SungLucian [Tae Woong' band mate]Support Role
- Seo Jin Won[Seon Gyeom's coach]Support Role
- Kim Shi Young[Coffee shop owner]Support Role
Guest Role
- Bong Joon Ho[Himself] (Ep. 1)Guest Role
- Kim Jung HoHwang Guk Geon [Professor] (Ep. 1)Guest Role
- So Yun Ho[Police officer] (Ep. 1)Guest Role
- Kim Ye WonChoi Tae Ri [Actress] (Ep. 1-3, 16)Guest Role
- Park Sang WonPark Gyu Deok [Seon Gyeom's track team junior] (Ep. 1-4, 6)Guest Role
- Na Ji HoonKim Gi Beom [Seon Gyeom's track team junior] (Ep. 1-4, 6)Guest Role
- Kim Yong Ho[Assistant coach] (Ep. 1-4, 6)Guest Role
- Bae Yoo RamHan Seok Won [Mi Joo's ex-boyfriend] (Ep. 1 & 16)Guest Role
- Ahn Jae Jun[Athlete] (Ep. 2)Guest Role
- Kim Min Sang[Tae Ri's manager](Ep. 2-3, 16)Guest Role
- Yoon Tae Hee[Maid] (Ep. 3)Guest Role
- Kim Mi HyeYoo Ah In [Reporter] (Ep. 3-4)Guest Role
- Son Young SunShin Ah Ryeon [Woo Shik's grandmother] (Ep. 3, 5, 10, 16)Guest Role
- Park Jung Eon[Disciplinary judge] (Ep. 3 & 6)Guest Role
- Kim Do Young[Disciplinary judge] (Ep. 3, 6)Guest Role
- Lee Jae Woo[Disciplinary judge] (Ep. 3, 6)Guest Role
- Geum Hae Na[Boxer] (Ep. 4)Guest Role
- Bret Allan LindquistRob Stark [Reporter] (Ep. 4-5)Guest Role
- Lee Soo BinLee Soo Bin [Track team girl] (Ep. 4, 7, 11, 13, 16)Guest Role
- Jung Myung Joon[Priest] (Ep. 5)Guest Role
- Ok Joo Ri[Church member] (Ep. 5)Guest Role
- Jo Yoo Jung[Church member] (Ep. 5)Guest Role
- Shim Young EunYoon Gong Ju [Mi Joo's college friend] (Ep. 5)Guest Role
- Lee Do YupNo Geun Seong [Assemblyman] (Ep. 5-6, 12)Guest Role
- Park Joo HeeHui Jin [Producer] (Ep. 5, 7-9, 16)Guest Role
- Kim Na YoungCho Hye Won [May's employee] (Ep 5, 7, 11)Guest Role
- Kim Kyung Ae[Restaurant owner] (Ep. 5 & 11)Guest Role
- Seo Jung YeonBang Bae Jeong [Track & Field coach] (Ep. 6-7)Guest Role
- Park Joo Yong[Tae Woong's manager] (Ep. 7, 9-10, 13, 16)Guest Role
- Lee Won HeeQuentin Park [Director] (Ep. 8)Guest Role
- Je Seung Hyun[Hairstylist] (Ep. 8)Guest Role
- Lee Moo Nyoung[Convenience store owner] (Ep. 8)Guest Role
- Park Gi Seon[Doctor] (Ep. 8)Guest Role
- Garrison Michael Farquharson-Keener[Cinematographer] (Ep. 8-9)Guest Role
- Kim Jae HwaYeom Gang sun / "Julie Yeom" [Producer] (Ep. 8-9)Guest Role
- Kim Won Hae[Bartender] (Ep. 8 & 16)Guest Role
- Park Jin Young[May's employee] (Ep. 11)Guest Role
- Park Joon Sang[Manger of Jieum Construction Track Team] (Ep. 13)Guest Role
- Kim Seon HoKim Sang Ho [Film director] (Ep. 16)Guest Role
- Kim Wang Yong[Mayor] (Ep. 9)Guest Role
- Lee Chang Won Guest Role
- Jung Min JooMin JuGuest Role
- Kim In Kyung[Staff] (Ep.1)Guest Role
- Kim Ki Ryung[Jeweler] (Ep. 5)Guest Role
- Choi Min Kyu[PE student] (Ep. 5)Guest Role
- Koo Do Kyun[Shop owner] (Ep. 13)Guest Role
- Kim Soo Jung[Myeong Pil's second wife] (Ep. 12)Guest Role
- Park Ji Won[Pharmacist] (Ep. 13)Guest Role
- Kang Choon Sung[Photographer] (Ep. 3 - 4)Guest Role
- Kim Chae Won[Team staff] (Ep. 14)Guest Role
- Ji Yun Seong[James' boyfriend (ep.9)]Guest Role
- Kim Young Joon[Ji Woo's assistant]Guest Role
- Jung Soon Mi[Pureun Keunsol School faculty]Guest Role
- Yang Yoon Hee[Chang Seop's mother] (Ep. 13)Guest Role
- Ji Han Ah[Soo Bin's aunt] (Ep. 13)Guest Role
- Park Joo Ha[Grocery store crying girl] (Ep. 5)Guest Role
Unknown
- Lee Ji Hyun Unknown
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