Shin Ren is a 16 year old girl with a dark and chilling past who secretly lives a double life, one as the most scary gloomy masked student at Bangtan High,and one, as the most dangerous masked assassin that shoots and kills under orders or requests from clients who pays her heavily to do it with out a trace.Her life is always been like that,the moment stepped in the Assassin Unit grounds. She doesn't think twice about what she was doing. She had already been use to it. She thinks nobody knows about her dark double life until the most popular kids at Bangtan High, Bts and Blackpink suddenly finds out about her double life when they accidentally witnessed her assassinate someone....