The story begins in a high school, a group of male students who specialize in bullying and sexual harassment with girls.  Yum is an attractive girl, she is tall and good at karate. Because of a traumatic past, she secretly disguised herself as a male student.  , Yum unexpectedly saw the bullying scene of boy group.  Not accepting that, she fought against the boy group.  Unexpectedly, her identity was discovered … and a sensual love story begins.