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Title: 스타트-업 / Start-Up
Also known as: 스타트업 / Startup
Formerly known as: 샌드박스 / Sandbox
Genre: Romance, Comedy
Episodes: 16
Broadcast network: tvN
Broadcast period: 2020-Oct-17 to 2020-Dec-06
Air time: Saturday & Sunday 21:00 (2 episodes back-to-back)


This drama is about a woman who dreams of becoming an entrepreneur like Steve Jobs, a man of natural science who becomes her first love, and another man who has to make that man look wonderful.

Seo Dal Mi (Bae Suzy) is a second-generation heiress who drops out of college to start her own company and be as successful as Steve Jobs. She also gives up her privileges and takes various jobs to raise the money she can use as capital.

Meanwhile, Nam Do San (Nam Joo Hyuk) is the founder of Samsan Tech. He is excellent with mathematics. He started Samsan Tech two years ago, but the company is not doing well. Somehow, Nam Do San becomes Seo Dal Mi’s first love. They cheer each others start and growth.


Main Cast

Bae Suzy as Seo Dal Mi
Heo Jung Eun as Seo Dal Mi (young)
Nam Joo Hyuk as Nam Do San
Kim Kang Hoon as Nam Do San (young)
Kim Sun Ho as Han Ji Pyung
Nam Da Reum as Ji Pyung (young)
Kang Han Na as Won In Jae
Lee Re as Won In Jae (young)

People around Seo Dal Mi

Kim Hae Sook as Choi Won Duk (Dal Mi’s grandmother)
Kim Joo Hun as Seo Chung Myung (Dal Mi & In Jae’s father)

People around Nam Do San

Kim Hee Jung as Park Geum Jung (Do San’s mother)
Kim Won Hae as Nam Sung Hwan (Do San’s father)
Jung Se Hyun (장세현) as Nam Chun Ho (Do San’s cousin)
Hong Boo Hyang (홍부향) as Chun Ho’s mother
Yoo Seung Il (유승일) as Chun Ho’s father

Samsan Tech

Kim Do Wan as Kim Yong San (software engineer)
Yoo Soo Bin as Lee Chul San (software engineer)

People around Han Ji Pyung

Seo Yi Sook as Yoon Sun Hak (SH Venture Capital CEO / Sandbox)
Kim Min Suk as Park Dong Chun (SH Venture Capital)

People around Won In Jae

Song Sun Mi as Cha Ah Hyun (In Jae & Dal Mi’s mother)
Uhm Hyo Sup as Won Doo Jung (In Jae’s stepfather)
Moon Dong Hyuk (문동혁) as Won Sang Soo (Doo Jung’s son)
Lee Min Ryung (이민령) as Yi Soo
Song Ho Soo (송호수) as Lee Dae Myung


Stephanie Lee as Jung Sa Ha (designer)
Cho Tae Kwan as Alex Kwon (2STO / Sandbox)
Yeo Jin Goo as AI Jang Young Shil (voice cameo)
Joo Bo Young (주보영) as Shin Jung
Kang Yoo Suk (강유석) as Shin Hyun


Park Choong Sun as Il Cheung Construction & Trading manager (ep. 1)
Park Young Soo as real estate agent (ep. 1)
Yoo Mi Ran (유미란) as real estate agent (ep. 1)
Ahn Soo Bin (안수빈) as Lee Min Ji (ep. 1)
Ji Sung Geun (지성근) as bus passenger (ep. 1)
Yoon Sul (윤설) as hotel waitress (ep. 2)
Kim Ji In (김지인) as Seo Hyun (Lucca The Tea) (ep. 2-3)
Jo Ah Ra (조아라) as Assistant Manager Jung (Lucca The Tea) (ep. 2-3)
Yoon Seo Hyun as human resources manager (Lucca The Tea) (ep. 2-3)
Bae Bo Ram (배보람) as barista (Lucca The Tea) (ep. 2)
Jung Ji Hyun (정지현) as barista (Lucca The Tea) (ep. 2)
Kwon Ki Joo (권기주) as deliveryman (ep. 3)
Ko Seung Joon (고성준) as Won In Jae’s developer (ep. 4)
Ko Han Min (고한민) as Ko Eun Hyun (ep. 4)
Kwon Ban Suk (권반석) as investor (ep. 4)
Kim Jin Ah (김진아) as hackathon CEO (ep. 5)
Jang Young Hyun (장영현) as hackathon CEO (ep. 5)
Im Sung Mi (임성미) as blind woman (ep. 8)
Koo Bon Jin (구본진) as police detective (ep. 8)
Moon Se Yoon as security guard (ep. 7)
Bae Hae Sun as Lee Hye Won (ep. 8)
Park Chan Ho as himself (ep. 8)
Lee Bo Young as pseudo-religion missionary (ep. 10)

Production Credits

Production Companies: Studio Dragon, HiSTORY D&C
Producer: Hwang Ki Yong
Director: Oh Choong Hwan
Screenwriter: Park Hye Ryun

Episode Ratings

Date Episode AGB TNmS
2020-10-17 1-1 4.278 -
2020-10-17 1-2 4.495 -
2020-10-18 2-1 4.208 -
2020-10-18 2-2 4.361 -
2020-10-24 3-1 4.789 -
2020-10-24 3-2 4.468 -
2020-10-25 4-1 4.334 -
2020-10-25 4-2 5.010 -
2020-10-31 5-1 4.274 -
2020-10-31 5-2 5.424 -
2020-11-01 6-1 4.136 -
2020-11-01 6-2 4.741 -
2020-11-07 7-1 4.521 -
2020-11-07 7-2 5.065 -
2020-11-08 8-1 3.821 -
2020-11-08 8-2 4.544 -
2020-11-14 9-1 4.879 -
2020-11-14 9-2 5.145 -
2020-11-15 10-1 3.954 -
2020-11-15 10-2 4.352 -
2020-11-21 11-1 4.130 -
2020-11-21 11-2 4.799 -
2020-11-22 12-1 4.270 -
2020-11-22 12-2 5.079 -
2020-11-28 13-1 4.666 -
2020-11-28 13-2 5.151 -
2020-11-29 14-1 4.573 -
2020-11-29 14-2 5.255 -
2020-12-05 15-1 4.382 -
2020-12-05 15-2 4.980 -
2020-12-06 16-1 4.841 -
2020-12-06 16-2 5.187 -

Sources: TNmS Media Korea & AGB Nielsen Korea (Nationwide)

*** Note: This drama is aired on Pay-TV channel which has fewer viewers than Free-TV channels. So, please don’t be surprised with the low rating. ***


Related Photo

(Other Photo from Official Site)

Official Site

Official Poster

Official Trailer
Trailer I
Trailer II
Trailer III
Trailer IV
Trailer V

Watch Online in Viki.com (Coming Soon)


  1. 1 : phoenix Says:

    A new Nam Joo Hyuk drama! His acting was amazing in The Light in Your Eyes, plus the writer and director have made some really great dramas in the past(while you were sleeping, my love from the star, hotel de luna etc.) It’s still a while before it airs, but I’m super stoked!

  2. 2 : Pocahontas11 Says:

    Nice casting.

  3. 3 : tigerb Says:

    i wonder if the ratings are because of the lead actors. need to watch to find out if really worth watching.

  4. 4 : Anadia Says:

    When watching ep 3 my heart is still going to second leaddddd oh writer why u make second lead character is much much strong then first lead.. 😭

  5. 5 : Anasahi Says:

    for me im not really into nam joo hyuk he still need alot work to do in his acting maybe bcoz he much popular than second lead. But second lead acting much better then him.

  6. 6 : Kakaoo Says:

    2nd lead syndrome really strooooong in here… im rooting for him

  7. 7 : OK OK OK Says:

    Watched ep 4. Nice I like it. 🙂

  8. 8 : Raionkisaki Says:

    I saw some clips and I’m waiting for it to end before start watching!!!

  9. 9 : TIRA Says:

    Enjoy this drama very much. Love the actors and actress

  10. 10 : nischuu Says:

    wish Jipyeong justice he deserve after since 1st ep was too strong to be handle with since the beginning, a very well act he portrayed best than the actual male lead

  11. 11 : mslatipah Says:

    What makes you want to follow the progress of the story?When the first episode is inviting.Thats what I felt after watching the first episode. My only hope is lets not turn Ji-Pyeong into an antagonist and damages his relationship with Dal Mi. Wishing they end up together.

  12. 12 : Mitch Says:

    Im excited for episode 9,

  13. 13 : Dewi Says:

    The best drama

  14. 14 : Lisa Says:

    Best drama ever

  15. 15 : laura Says:

    i dont like nam joo, ………………… i agree with @nischuu … the characther second lead more powerful, more active, more nice, more smart, more wise, more kind, and more charming…

  16. 16 : Rose Says:

    Beautiful story and great cast. Always looking forward to the next episode. Team Good Boy all the way. 🙂

  17. 17 : Jasimah Says:

    The best drama 2020😍

  18. 18 : Jasimah Says:

    Beautiful story and great cast. And i love suzy. 😍😍

  19. 19 : miss L Says:

    Writernim please listen to your viewers. Maybe thats the reason why the ratings now is getting low. HJP flr the win! He is mature and reliable. Pkease…. please…. please….

  20. 20 : #JipyeongEndGame Says:

    the writer should have knew better about the character development jipyeong has been built ever since since, stop turning him into such a useless character

    agreed with @miss L said about writer should have listen to viewers more if they want to play safe or nobody would ever satisfied with this crappy story line, but ruining Jipyeong when he’s been the ‘Good Guy’ all his life. Now its all thanks to Kim Seonho for making Jipyeong life exist and even more valuable person on earth from above characters.

  21. 21 : Vina Says:

    Best drama 2020

  22. 22 : cutteee Says:

    Han ji pyung ❤️

  23. 23 : Rocketspeed Says:

    Best drama of the year 2020. Bae Suzy is the best!

  24. 24 : Rocketspeed Says:

    I cannot understand all this negativity for the main lead. These commenters want to coerce the writer’s style. They are out to influence her storytelling and demanding an endgame to their liking. This is such a good drama and deserves better!

  25. 25 : Lemon Says:

    Hoping happy ending for Han Ji Pyung. Please dont hurt him at the end… rooting for kim sun ho

  26. 26 : Lone Thar Says:

    The best korea drama for 2020.

  27. 27 : Lone Thar Says:

    I love this drama

  28. 28 : Lone Thar Says:

    Start up 💜💜💜💜💜

  29. 29 : Lone Thar Says:

    Start up #Team Dosan#💜💜💜

  30. 30 : Yamin Says:

    Start up #Team Dosan#💜

  31. 31 : TheintTheintWin Says:

    Start up #Team Dosan#💜

  32. 32 : Hlawn Says:

    I love this drama ❤️

  33. 33 : Unnie Says:

    Start Up #NamDoSam

  34. 34 : Mandaa Says:

    Start up #DoDal ❤❤

  35. 35 : Jihan Says:

    Jipyeong x Happiness and justice as always

  36. 36 : annmasae Says:

    Great drama. Sorry that ratings were not higher.
    Nice ending unlike many korean dramas.
    The technical aspects were interesting too for geeks like me.
    Hope at least cast wins a lot of awards despite low ratings.
    Glad Netflix aired this drama.
    #Team DoSan (fighting)

  37. 37 : Audrey Rubiano Says:

    Emocionante de principio a fin, deja varios mensajes positivos para la familia, la juventud y para la vida en general, excelente 🤗

  38. 38 : IRENE T ASUNCION Says:

    I love this drama, the story, the cast and the setting… great job..
    what makes me interesting in this drama is you learn something new, that you never watched before from other drama. its all start from the grandmother who bring all together. hope there are still someone who like grandmother who share her truly care, love and help even not her own grandchild.

    For the writer good luck to your new story!

  39. 39 : KDDD# Says:

    Absolutely love this drama, each character of the show warms your heart… quite a fresh storyline and keeps you entertained!

  40. 40 : Kiki Says:

    This drama has inspired me. I love the cast and ost. Start-Up had so much potential but it’s also lacking. I still love it tho, very much.

  41. 41 : tigerb Says:

    njh was perfect to his role here

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