A mentally challenged young orphan girl named Park Eun Hye (Park Se Wan) is tricked by her malevolent classmates into mixing with brutal underworld gangsters who eventually hold her captive, sexually abusing and mistreating her. However, these mobsters have not figured on crossing the path of Park Eun Hye’s older sister, Park In Ae (Lee Si Young). A former champion martial artist, Park In Ae has served 18 months in prison for assault. But when she is released, she learns what has happened to her younger sister – and pledges to free the young girl, no matter what the cost. In her way stands a whole host of underworld lowlifes, armed to the teeth, and unafraid of using physical violence on a woman. However, Park In Ae excels when it comes to defending herself,. She has more than a few tricks up her sleeve – and the mobsters are about to realize they’ve messed with the wrong woman… “No Mercy” is a 2019 South Korean movie that was directed by Im Kyung Taek.