

The Devil You Know
Yu-jeong is a star English tutor, popular nationwide for her lessons and beauty. She has the perfect life going on- her education business is blooming, she has a successful doctor husband and a loving daughter. One day, she meets Sun-hee from a volunteer group. He seems like a friendly guy with charms. Gang-su, Yu-Jeong's childhood friend who is like a little brother to her, however warns her about Sun-hee that he has a bad reputation even among gangsters. But what Yu-jeong doesn't realize is that Sun-hee is a narcissistic sociopath- until it's too late. Meanwhile, Sun-hee's gang brothers steal money behind his back, and Sun-hee's old time friend approaches him to start a new drug business. Yu-jeong fights tooth and nails to break free from Sun-hee and enlists Gang-su's help- and everything turns deadly when it all reaches a boiling point.
TMDB
5.5/10
2 votes
- Status
- Released
- Budget
- —
- Box office
- —
- Language
- Korean
Top billed cast
Behind the camera
Where to watch
Availability for South Korea. Provided by JustWatch through the TMDB API.
Stream
TVING
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Release dates
South KoreaKR
- Theatrical152025-MF0130520 Jun 2025
Frequently asked questions
The Devil You Know was released on 20 June 2025.
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