Start-Up

Composer

• 
  Park Se Jun

Director

• 
  Oh Choong Hwan

Screenwriter

• 
  Park Hye Ryun

Main Role

• 
  Bae Suzy

  Seo Dal Mi

  Main Role
• 
  Nam Joo Hyuk

  Nam Do San

  Main Role
• 
  Kim Seon Ho

  Han Ji Pyeong

  Main Role
• 
  Kang Han Na

  Won In Jae

  Main Role

Support Role

• 
  Kim Hae Sook

  Choi Won Deok

  Support Role
• 
  Kim Do Wan

  Kim Yong San [Software engineer]

  Support Role
• 
  Yoo Soo Bin

  Lee Cheol San [Software engineer]

  Support Role
• 
  Stephanie Lee

  Jung Sa Ha [Sandbox]

  Support Role
• 
  Kim Hee Jung

  Park Geum Jung [Do San's mother]

  Support Role
• 
  Kim Won Hae

  Nam Seong Hwan [Do San's father]

  Support Role
• 
  Jang Se Hyun

  Nam Cheon Ho [Do San's cousin]

  Support Role
• 
  Song Sun Mi

  Cha Ah Hyeon [Dal Mi and In Jae's mother]

  Support Role
• 
  Um Hyo Sup

  Won Du Jeong [In Jae's stepfather]

  Support Role
• 
  Moon Dong Hyeok

  Won Sang Su [In Jae's stepbrother]

  Support Role
• 
  Seo Yi Sook

  Yun Seon Hak [SH Venture Capital director]

  Support Role
• 
  Kim Min Seok

  Park Dong Cheon [SH Venture Capital employee]

  Support Role
• 
  Jasper Cho

  Alex Kwon [2STO]

  Support Role
• 
  Kang You Seok

  Sin Hyeon [Developer]

  Support Role
• 
  Joo Bo Young

  Sin Jeong [Developer]

  Support Role
• 
  Song Ho Soo

  Lee Dae Myeong [In Jae's employee]

  Support Role
• 
  Lee Min Ryung

  I Su [In Jae's employee]

  Support Role

Guest Role

• 
  Ahn Soo Bin

  Lee Min Ji (Ep. 1)

  Guest Role
• 
  Ji Sung Geun

  [Bus passenger] (Ep. 1)

  Guest Role
• 
  Park Young Soo

  [Real estate agent] (Ep. 1)

  Guest Role
• 
  Yoo Mi Ran

  [Real estate agent] (Ep. 1)

  Guest Role
• 
  Kim Jong Ho

  [SH Venture Capital employee] (Ep. 1)

  Guest Role
• 
  Park Choong Seon

  [Il Cheung Constructon & Trading manager] (Ep. 1)

  Guest Role
• 
  Nam Da Reum

  Han Ji Pyeong [Young] (Ep. 1-2)

  Guest Role
• 
  Lee Re

  Won In Jae [Young] (Ep. 1, 16)

  Guest Role
• 
  Heo Jung Eun

  Seo Dal Mi [Young] (Ep. 1, 3-4, 16)

  Guest Role
• 
  Kim Kang Hoon

  Nam Do San [Young] (Ep. 1, 5, 9, 12)

  Guest Role
• 
  Kim Joo Heon

  Seo Chung Myeong [Dal Mi and In Jae's father] (Ep. 1, 4, 16)

  Guest Role
• 
  Choi Yun Seol

  [Hotel waitress] (Ep. 2)

  Guest Role
• 
  Bae Bo Ram

  [Lucca The Tea barista] (Ep. 2)

  Guest Role
• 
  Jung Ji Hyun

  [Lucca The Tea barista] (Ep. 2)

  Guest Role
• 
  Kim Ji In

  Seo Hyeon [Lucca The Tea employee] (Ep. 2-3)

  Guest Role
• 
  Jo Ah Ra

  Assistant Manager Jung [Sa Ha's sister] (Ep. 2-3, 13, 16)

  Guest Role
• 
  Yoon Seo Hyun

  [Lucca The Tea HR manager] (Ep. 2-3)

  Guest Role
• 
  Kwon Ki Joo

  [Deliveryman] (Ep. 3)

  Guest Role
• 
  Yu Seung Il

  [Cheon Ho's father] (Ep. 3)

  Guest Role
• 
  Hong Boo Hyang

  [Cheon Ho's mother] (Ep. 3)

  Guest Role
• 
  Go Han Min

  Ko Eun Hyeon (Ep. 4)

  Guest Role
• 
  Kwon Ban Suk

  [Investor] (Ep. 4)

  Guest Role
• 
  Oh Ji Yeon

  [Investor] (Ep. 4)

  Guest Role
• 
  Joo Seung Min

  [Investor] (Ep. 4)

  Guest Role
• 
  Ko Seong Jun

  [In Jae's developer] (Ep. 4)

  Guest Role
• 
  Bae Yoo Ri

  [Hackathon CEO] (Ep. 5)

  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
• 
  Oh Young Mi

  [Student's mother] (Ep. 5, 9)

  Guest Role
• 
  Park Seung Chan

  [Doctor] (Ep. 6)

  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 Seon

  Lee Hye Won [Seonju CEO] (Ep. 8)

  Guest Role
• 
  Gu Bon Jin

  [Detective] (Ep. 8)

  Guest Role
• 
  Im Sung Mi

  [Blind woman] (Ep. 8)

  Guest Role
• 
  Park Chan Ho

  Park Chan Ho (Ep. 8, 12)

  Guest Role
• 
  Lee Dong Hee

  O Yeon Ho (Ep. 9-10)

  Guest Role
• 
  Yang Dae Hyuk

  Choi Yang Won [Reporter] (Ep. 9-10)

  Guest Role
• 
  An Young Mi

  [Waitress] (Ep. 10)

  Guest Role
• 
  Lee Bo Young

  [Woman at pub] (Ep. 10)

  Guest Role
• 
  O Gyu Taek

  [Park cleaning man] (Ep. 10)

  Guest Role
• 
  Lee Da Hae

  [Start-up CEO] (Ep. 10-11)

  Guest Role
• 
  Jung Jun Hwan

  [Hackathon participant] (Ep. 10-11)

  Guest Role
• 
  Jung Wook Jin

  Kim Dong Su (Ep. 11)

  Guest Role
• 
  Bret Allan Lindquist

  [2STO employee] (Ep. 11-12)

  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
• 
  Kim Sung Yeol

  [Photographer] (Ep. 14)

  Guest Role
• 
  Park Sang Hyun

  [Magazine staff] (Ep. 14)

  Guest Role
• 
  Yeo Jin Goo

  Jang Yeong Sil [Voice] | Hong Ji Seok [CEO of Chan Seong Ltd.] (Ep. 16)

  Guest Role
• 
  Hong Seong Gwan

  [Startup guy] (Ep. 16)

  Guest Role
• 
  Ahn Ji Hwan

  Han Gang Jin

  Guest Role
• 
  Kim In Sun

  [Cafe part-timer]

  Guest Role
• 
  Jang Woo Jun

  [Playground boy]

  Guest Role
• 
  Hong Eun Jeong

  [Woman on the rain]

  Guest Role
• 
  Jung Joon

  [Autograph student]

  Guest Role
• 
  Jeong Si Hun

  [Handsome man in neighborhood]

  Guest Role
• 
  Kim Hyun Mok

  [New tenant in the old Sam San Tech office]

  Guest Role
• 
  Kim Seong In Guest Role
• 
  Lee Chang Won Guest Role

Unknown

• 
  Kang Sung Chan Unknown