The Boys Who Cried Wolf (2016)

Wan Joo is a stage actor and also makes money on the side playing roles for clients. He is then asked to act as a witness in a murder case by the victim's mother. Wan Joo doesn't like the idea, but he needs the money and accepts. He goes to the police station and gives a false testimony. But then he realizes that his false statement brands an innocent young man as the murderer. To get the investigation back on track, Wan Joo seeks out the person who asked him to lie, only to discover that she isn’t who she said she was.