Intruder is a 2020 South Korean mystery thriller movie directed by Son Won-pyung. The movie stars Song Ji-hyo as Yoo-jin, Kim Moo-yul as Seo-jin, and Ye Soo-jung as Seo-jin's mother.
The story is about Seo-jin, who is struggling to move on from the death of his wife. He lives a lonely life with his young daughter and elderly mother. When his wife's long-lost sister, Yoo-jin, suddenly appears after 25 years of disappearance, Seo-jin starts to question her identity and the circumstances surrounding her sudden appearance.
As Yoo-jin tries to fit back into the family, strange things begin to happen around her. Seo-jin starts to suspect that Yoo-jin may not be who she claims to be, and her presence may have a dark secret from the past.
Intruder is filled with suspenseful twists and turns, keeping the audience on the edge of their seats. The movie delves into themes of family conflicts, grief, and identity, with a satisfying and surprising conclusion.
Overall, Intruder is a well-executed thriller that keeps the audience guessing until the end. The cast's performances are top-notch, with Song Ji-hyo delivering a compelling performance as the mysterious Yoo-jin.