The movie “Sister” is a South Korean action film. The story revolves around the character of Eun-Hye (played by Park Se-wan) who goes missing, and her sister In-Hye (played by Lee Si-young) who gradually unleashes her rage. This is an action film with a theme of revenge. In the film, Lee Si-young portrays In-Hye, a full-time bodyguard who ends up in prison due to a dispute over excessive protection. After being released, she dreams of living an ordinary life with her sister, only to find out that her sister has suddenly disappeared. Neither the school nor the police are willing to help, so In-Hye has to search for her sister on her own.