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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.

The Devil You Know (2025) streaming availability varies by region. Check Netflix, Prime Video, Disney+, and other major platforms. It may also be available for digital rental or purchase on Amazon, Apple TV, or Vudu.
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...
The Devil You Know (2025) was directed by Hyun Woo-sung. The film is a Thriller, Crime production with a runtime of 1h 44m, rated 5.5/10.
The Devil You Know runs 1h 44m (104 minutes total). Audience rating: 5.5/10 from 2 votes. Genre: Thriller, Crime.
The Devil You Know is rated 5.5/10 by 2 viewers — below average. A good pick for Thriller and Crime fans.