Keys to the Heart
“Off-tune brothers unite!”
An older brother is a washed-up boxer. His younger brother is a genius pianist with physical disability. The brothers make up through their mother who is full of stories of her past.
Where to watch Keys to the Heart in United States
No streaming info for your region.
Click a service to open Keys to the Heart there. Availability last verified on June 21, 2026.
Where is Keys to the Heart streaming around the world?
| Country | Streaming on | Rent / Buy |
|---|---|---|
| Japan | Amazon Prime Video, Hulu, U-NEXT, Amazon Prime Video with Ads | Amazon Video |
| South Korea | Netflix, Watcha, Netflix Standard with Ads, TVING | wavve |
About Keys to the Heart
Keys to the Heart is a 2018 Korean-language drama and comedy film directed by Choi Sung-hyun. The cast is led by Lee Byung-hun, Youn Yuh-jung, Park Jeong-min. It has a runtime of 2h 0m.
Keys to the Heart was produced by CJ Entertainment and JK Film and made in South Korea. It was released on January 17, 2018.
- Director
- Choi Sung-hyun
- Writers
- Choi Sung-hyun
- Release date
- January 17, 2018
- Original language
- Korean
- Status
- Released
- Country
- South Korea
- Production
- CJ Entertainment, JK Film
Keys to the Heart cast & crew
Keys to the Heart was directed by Choi Sung-hyun and written by Choi Sung-hyun.
The cast features Lee Byung-hun as Kim Jo-ha, Youn Yuh-jung as In-sook, Park Jeong-min as Jin-tae, Han Ji-min as Ga-yool, Kim Sung-ryung as Ms. Hong, and Choi Ri as Soo-jung.
Behind the camera, the score was composed by Hwang Sang-jun, cinematography is by Kim Tae-sung, and it was produced by Son Suk-woo and Kil Young-min.
Is Keys to the Heart worth watching?
At 2h 0m, it's a standard feature-length watch.
If you enjoy drama and comedy, Keys to the Heart is worth a place on your watchlist.
How and where to watch Keys to the Heart
Keys to the Heart isn't currently available on major streaming services in United States. We track availability continuously — add it to your watchlist and we'll keep an eye out.
Streaming rights change country by country and month by month, so the options above reflect United States today — switch your country at the top of the where-to-watch section to see availability elsewhere.
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Cast of Keys to the Heart
Lee Byung-hun
Kim Jo-ha
Youn Yuh-jung
In-sook
Park Jeong-min
Jin-tae
Han Ji-min
Ga-yool
Kim Sung-ryung
Ms. Hong
Choi Ri
Soo-jung
Bek Hyun-jin
Dong-soo
Hwang Seok-jeong
Chief Kang
Park Ji-yeon
Yougn In-sook
Moon Sook
Bok-ja
Oh Hye-won
Bok-ja's Guard
Lee Zoo-young
Eun-ha
Keys to the Heart — FAQs
▸Where can I watch Keys to the Heart in United States?
Keys to the Heart is not currently available on major streaming services in United States. Availability changes often — check back soon.
▸What language is Keys to the Heart in?
Keys to the Heart is originally in Korean. Subtitle and dub options vary by streaming service.
▸How long is Keys to the Heart?
Keys to the Heart runs 2 hours 0 minutes (120 minutes).
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