Start-Up – Cast & Summary

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Start-Up - Cast, Summary, Synopsis, OST, Episode, Review

Since the Start-Up drama make its first airing date on October 17, 2020, on tvN, this drama was already a huge success.

Initially, the title of this drama was Sandbox, but the production team changed it to Start-Up.

Start-Up is starred by four main actors, Bae Suzy, Nam Joo Hyuk, Kim Seon Ho, and also Kang Hanna.

Bae Suzy is popular because of her main role in Uncontrollably Fond (2016), While You Were Sleeping (2017), and Vagabond (2019).

Nam Joo Hyuk had starred in Weightlifting Fairy Kim Bok Joo (2016), The Bride of Habaek (2017), and The Light In Your Eyes (2019).

Previously, Seon Ho also had become the main actor for Catch the Ghost (2019), meanwhile Kang Hanna once starred in Just Between Lovers (2017) and Familiar Wife (2018).

This drama was aired every Saturday and Sunday on tvN at 21.00 KST to replace the previous drama, Stranger 2.

Read more: The Veil – Cast & Summary


  • Title: Start-Up / 스타트업
  • Also Known As: Startup / Sandbox / Seutateueop / seutateueob / Saendeubakseu
  • Genre: Drama, Romance
  • Country: South Korea
  • Director: Oh Choong Hwan
  • Producer: Hwang Ki Young, Son Sa Young, Lim Hyeong Seop, Kwon Kyung Hyun
  • Screenwriter: Park Hye Ryun
  • Production Companies: Studio Dragon
  • Network: tvN
  • Episodes: 16
  • Air Dates: October 17, 2020 – December 6, 2020
  • Air Time: Saturday and Sunday, 21:00 KST
Start-Up - Cast, Summary, Synopsis, OST, Episode, Review

Synopsis of Start-Up

Seo Dal Mi (Bae Suzy) was separated from her older sister, Won In Jae (Kang Hanna) because their parents were divorced a long time ago.

After their parents divorce, they live a different life. Dal Mi lives with her grandmother and father in not-so-luxurious life, meanwhile In Jae lives with her mother and her new wealthy family.

Time passed by and Dal Mi’s father passed away because of an accident. Continuing her life, Dal Mi decided to drop out of her college and build her own business.

Dal Mi then became a part-time worker in a cafe. Her biggest dream is to be as successful as Steve Jobs.

On the other hand, there’s a founder of a technology start-up company, Samsan Tech. The CEO is Nam Do San, a mathematic genius, and also Dal Mi’s first love because of an accident.

Even though Do San is the CEO of her own company, Samsan Tech doesn’t run well. One day, they meet each other and grow their business bigger than before.

Read more: Lost – Cast & Summary

Main Cast

Start-Up - Cast, Summary, Synopsis, OST, Episode, Review

Bae Suzy as Seo Dal Mi

An ambitious, hard worker, and a high-spirit girl boss. Even though she has been raised in poor family background, Dal Mi still has a grand dream to be a great businesswoman.

Start-Up - Cast, Summary, Synopsis, OST, Episode, Review

Nam Joo Hyuk as Nam Do San

A mathematic genius who is excellent in any kind of school subject, but doesn’t really have great leadership skills.

He is the CEO of Samsan Tech and his life changes forever when he meets Dal Mi.

Kim Seon Ho as Han Ji Pyeong

Kim Seon Ho as Han Ji Pyeong

A very smart and genius team leader of SH Venture Capital. He has a special skill in investment and is sharp-tongued about anything involves in the business field.

Kang Hanna as Won In Jae

Kang Hanna as Won In Jae

Seo Dal Mi’s older sister who is lucky because she has a beautiful appearance, smart, and raised in a wealthy family.

Supporting Cast

Seo Dal Mi and Won In Jae’s Family

  • Kim Hae Sook as Choi Won Deok (Dal Mi’s grandmother)
  • Song Seon Mi as Cha Ah Hyun (Dal Mi’s mother)
  • Kim Joo Hun as Seo Chung Myung (Dal Mi’s father)
  • Eom Hyo Seop as Won Doo Jung (Won In Jae’s stepfather)
  • Moon Dong Hyeok as Won Sang-soo (In Jae’s stepbrother)

Samsan Tech

  • Yoo Su Bin as Lee Chul San
  • Kim Do Wan as Kim Yong San
  • Stephanie Lee as Jeong Sa Ha

Nam Do San’s Family

  • Kim Hee Jung as Park Geum Jung (Do San’s mother)
  • Kim Won Hae as Nam Sung Hwan (Do San’s father)
  • Jang Se Hyun as Nam Chun Ho (Do San’s cousin)

SH Venture Capital

  • Seo Yi Sook as Yoon Seon Hak
  • Kim Min Seok as Park Dong Cheon


  • Jasper Cho as Alex Kwon
  • Kang Yoo Seok as Shin Hyeon
  • Joo Bo Young as Shin Jeong
  • Kim Ji In as Seo Hyun
  • Yeo Jin Goo as Jang Young Shil (voice)
  • Lee Bo Young as woman at pub
  • Moon Se Yoon as security guard
  • Park Chan Ho as Nam Do San’s favorite baseball athlete
  • Bae Hae Sun as Lee Hye Won

OST (Original Soundtrack)

  • Future – Red Velvet
  • Day & Night – Jung Seung Hwan
  • One Day – Kim Feel
  • I Know – OH MY GIRL
  • Running – Gaho
  • Where Is Dream – 10cm
  • My Love – Davichi
  • Even For A Moment – CHEEZE
  • Blue Bird – Ailee
  • Lonesome Diary – Sandeul (B1A4)
  • Two Words – Wendy (Red Velvet)
  • Love Letter – Bolbbalgan4
  • Dream – Jamie
  • My Dear Love – Bae Suzy
  • Love Me Like You Used To – Kassy
  • To Me – Jung Eunji (Apink)
  • Care About You – K. Will

Trailer of Start-Up