The Witness is a 2018 South Korean crime thriller film directed by Jo Kyu-jang. It stars Lee Sung-min, Kim Sang-ho, Jin Kyung and Kwak Si-yang. It was released theatrically in South Korea on August 15, 2018. The film is about a man who witnesses a murder and takes no action on what he has seen.

Plot

One night at his apartment, Sang-Hoon hears a woman's scream. He looks outside his apartment and sees Tae-Ho hitting a woman with a hammer. Sang-Hoon and Tae-Ho then make direct eye contact. Sang-Hoon does not call the police. The next day, that woman is found dead. Detective Jae-Yeob investigates the case. Sang-Hoon is still terrified and does not tell Detective Jae-Yeob about what he witnessed. Soon, another resident who witnessed the same murder is killed by Tae-Ho. Sang-Hoon tries to protect himself and his family from the murderer.