Sometimes work can have unexpected consequences. When Prosecutor Lee goes undercover to investigate a major crime family in Haeundae, the eastern part of Pusan, South Korea, he gets into an accident and loses his memory. He then mistakenly believes that his undercover identity is his true identity. When he falls in love with So Ra, the mob boss’s daughter, the betrothed prosecutor’s life gets complicated. Will he be able to recover his memory or live out his life as a gangster?