Thunder's older sister Sandara passed away, which left the family devastated. Sandara had gotten a scholarship for a famous high school which also would make her able to get into college. Therefore Thunder’s parents told Thunder, who looked like his sister really well, to dress up as a girl and fake to be his sister. Here Thunder makes friends with Seungho and feelings begin to steer, but Seungho doesn’t know Thunder is indeed a guy and not a girl, how will he take it when and if he finds out? Thunder's older sister Sandara passed away, which left the family devastated. Sandara had gotten a scholarship for a famous high school which also would make her able to get into college. Therefore Thunder’s parents told Thunder, who looked like his sister really well, to dress up as a girl and fake to be his sister. Here Thunder makes friends with Seungho and feelings begin to steer, but Seungho doesn’t know Thunder is indeed a guy and not a girl, how will he take it when and if he finds out?