What's Wrong with Secretary Kim (Korean: 김비서가 왜 그럴까; Japanese: キム秘書はいったい、なぜ？) is a romcom loved so much it is called "the standard of office romcoms." A handsome, brilliant but hopelessly narcissistic vice chairman tries every trick to stop the secretary who has supported him for nine years from quitting. Starring Park Seo-joon and Park Min-young.
📺 Drama Info
| Broadcast | June 6 – July 26, 2018 (tvN, Korea) |
| Episodes | 16 |
| Genre | Romantic comedy (office romcom) |
| Original | A web novel by Jung Kyung-yoon (published 2013) |
| In Japan | Aired on Mnet from October 2018; now on several streaming services |
👥 Main Cast
- Park Seo-joon as Lee Young-joon (vice chairman of Yumyung Group)
- Park Min-young as Kim Mi-so (secretary)
- Lee Tae-hwan (5urprise) as Lee Sung-yeon (Young-joon's older brother, a writer)
- Kim Byung-ok as Lee Dong-sook (chairman)
- Kim Hye-ok as Choi Hye-ran
Role-name spellings differ between media; we list what we could confirm.
📖 Plot (no spoilers)
Lee Young-joon, vice chairman of the large Yumyung Group, is perfect but extremely narcissistic. His secretary Kim Mi-so has supported him for nine years.
One day Mi-so suddenly announces she wants to quit to start a new life, and Young-joon desperately tries to keep her. Along the way, feelings slowly grow between the two.
✨ Three Reasons to Watch
- Park Seo-joon's narcissism — a comic performance, and the gap as it crumbles when his feelings for Mi-so grow
- Park Min-young's reliability as the capable, level-headed Mi-so — one of her signature romcoms
- The secret of their past — hidden behind nine comic years is a childhood episode that warms the heart
Park Min-young also stars in Nine to Six (Prime Video, premiering November 25).
🎬 Where to Watch in Japan
As of October 2026 it was listed on U-NEXT, Netflix, Amazon Prime Video (included), Disney+, J:COM STREAM (included) and Mnet Smart+. Availability changes; please check each service.
❓ Frequently Asked Questions
How many episodes does What's Wrong with Secretary Kim have?
16 episodes.
Who stars in it?
Park Seo-joon (Lee Young-joon) and Park Min-young (Kim Mi-so).
When did it air?
From June 6 to July 26, 2018 on tvN in Korea.
Is it based on a web novel?
Yes — a web novel by Jung Kyung-yoon (published in 2013).
Where can I watch it in Japan?
As of October 2026: U-NEXT, Netflix, Amazon Prime Video, Disney+, J:COM STREAM and Mnet Smart+ (availability may change).
Based on information as of October 2026. Streaming availability changes — please check each service.