Composer
Director
Screenwriter
Main Role
- Bae Suzy Main Role
- Nam Joo Hyuk Main Role
- Kim Seon HoHan Ji PyungMain Role
- Kang Han NaWon In JaeMain Role
Support Role
- Kim Hae Sook Support Role
- Kim Do WanKim Yong San [Software engineer]Support Role
- Yoo Soo BinLee Cheol San [Software engineer]Support Role
- Stephanie LeeJung Sa Ha [Sandbox]Support Role
- Kim Hee JungPark Geum Jung [Do San's mother / Seong Hwan's wife]Support Role
- Kim Won HaeNam Seong Hwan [Do San's father / Geum Jung's husband]Support Role
- Jang Se HyunNam Cheon Ho [Do San's cousin]Support Role
- Song Sun MiCha Ah Hyun [Dal Mi & In Jae's mother]Support Role
- Uhm Hyo SubWon Doo Jung [In Jae's Stepfather]Support Role
- Moon Dong HyukWon Sang Soo [In Jae's stepbrother]Support Role
- Seo Yi SookYoon Seon Hak [SH Venture Capital Director]Support Role
- Kim Min SeokPark Dong Chun [SH Venture Capital employee]Support Role
- Jasper ChoAlex Kwon [2STO]Support Role
- Kang Yoo SeokShin Hyun [Developer]Support Role
- Joo Bo YoungShin Jung [Developer]Support Role
- Song Ho SooLee Dae Myung [In Jae's employee]Support Role
- Lee Min RyungYi Soo [In Jae's employee]Support Role
Guest Role
- Kim Jong Ho[SH Venture Capital employee] (Ep. 1)Guest Role
- Park Choong Seon[Manager of Il Cheung Constructon & Trading] (Ep. 1)Guest Role
- Park Young Soo[Real estate agent] (Ep. 1)Guest Role
- Yoo Mi Ran[Real estate agent] (Ep. 1)Guest Role
- Ahn Soo BinLee Min Ji (Ep. 1)Guest Role
- Ji Sung Geun[Bus passenger] (Ep. 1)Guest Role
- Nam Da ReumHan Ji Pyung [Young] (Ep. 1-2)Guest Role
- Heo Jung EunSeo Dal Mi [Young] (Ep. 1, 3-4, 16)Guest Role
- Kim Joo HeonSeo Chung Myung [Dal Mi and In Jae's father] (Ep. 1, 4, 16)Guest Role
- Kim Kang HoonNam Do San [Young] (Ep. 1, 5, 9, 12)Guest Role
- Lee ReWon In Jae [Young] (Ep. 1, 16)Guest Role
- Bae Bo Ram[Barista, Lucca The Tea] (Ep. 2)Guest Role
- Kim Ji InSeo Hyun [Lucca The Tea employee] (Ep. 2-3)Guest Role
- Jung Ji Hyun[Barista, Lucca The Tea] (Ep. 2)Guest Role
- Choi Yun Seol[Hotel waitress] (Ep. 2)Guest Role
- Yoon Seo Hyun[HR manager at Lucca The Tea] (Ep. 2-3)Guest Role
- Jo Ah RaAssistant Manager Jung [Lucca The Tea / Sa Ha's sister] (Ep. 2-3, 13, 16)Guest Role
- Yu Seung Il[Cheon Ho's father] (Ep. 3)Guest Role
- Hong Boo Hyang[Cheon Ho's mother] (Ep. 3)Guest Role
- Kwon Ki Joo[Deliveryman] (Ep. 3)Guest Role
- Ko Seong Jun[In Jae's developer] (Ep. 4)Guest Role
- Go Han MinGo Eun Hyun (Ep. 4)Guest Role
- Kwon Ban Suk[Investor] (Ep. 4)Guest Role
- Kim Chae Hyun[Hackathon CEO] (Ep. 5)Guest Role
- Jang Young Hyun[Hackathon CEO] (Ep. 5)Guest Role
- Kim Sung Yong[College math teacher] (Ep. 5)Guest Role
- Seol Chang Hee[Cheol San's co-worker] (Ep. 6)Guest Role
- Moon Se Yoon[Security guard] (Ep. 7)Guest Role
- Bae Hae SeonLee Hye Won [Seonju CEO] (Ep. 8)Guest Role
- Im Sung Mi[Blind woman] (Ep. 8)Guest Role
- Gu Bon Jin[Detective] (Ep. 8)Guest Role
- Park Chan HoPark Chan Ho (Ep. 8, 12)Guest Role
- Lee Dong HeeOh Yeon Ho (Ep. 9-10)Guest Role
- Yang Dae HyukReporter Choi Yang Won (Ep. 9-10)Guest Role
- Lee Da Hae[Start-up CEO] (Ep. 10-11)Guest Role
- Lee Bo Young[Woman at pub] (Ep. 10)Guest Role
- Oh Kyu Taek[Park cleaning man] (Ep. 10)Guest Role
- Jung Wook JinKim Dong Su (Ep. 11)Guest Role
- Jun Joon Woo[2STO employee] (Ep. 11-12)Guest Role
- Kim Ji Su[Flight attendant] (Ep. 12)Guest Role
- Jang Hae Song[Insurance salesman] (Ep. 13)Guest Role
- Shin Dong Hoon[Investor] (Ep. 14)Guest Role
- Jeon Yeo Jin[Investor] (Ep. 14)Guest Role
- Lim Seung Beom[Investor] (Ep. 14)Guest Role
- Yeo Jin GooJang Yeong Shil [Voice] | Hong Ji Seok [CEO of Chan Seong Ltd.] (Ep. 16)Guest Role
- Kim Hyun Mok[New tenant in the old Sam San Tech office]Guest Role
- Kim Seong In Guest Role
- Jung Joon[Autograph student]Guest Role
- Jung Jun Hwan[hackathon participant (ep.10-11)]Guest Role
- Lee Chang Won Guest Role
- Park Seung Chan[Doctor] (Ep.6)Guest Role
- Ahn Ji HwanHan Kang JinGuest Role
- Bae Yoo Ri[Hackathon CEO] (Ep. 5)Guest Role
- Joo Seung Min[Investor] (Ep. 4)Guest Role
- Bret Allan Lindquist[2STO employee] (Ep. 11-12)Guest Role
- Hong Eun Jeong[Woman in the rain]Guest Role
- Oh Young Mi[Student's mother] (Ep. 5, 9)Guest Role
- Hong Seong Gwan[Startup guy] (Ep. 16)Guest Role
- Oh Ji Yeon[Investor] (Ep. 4)Guest Role
- Jang Woo Jun[Playground boy]Guest Role
- An Young Mi[Waitress] (Ep. 10)Guest Role
- Jeong Si Hun[Handsome man in neighborhood]Guest Role
- Kim Sung Yeol[Photographer] (Ep. 14)Guest Role
- Park Sang Hyun[Magazine staff] (Ep. 14)Guest Role
- Kim In Sun[Cafe part-timer]Guest Role
Unknown
- Kang Sung Chan Unknown
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