When your older brother is admitted to hospital, you're willing to do anything for him to stay alive. Even if that means disguising as a guy and entering the brutal competition GROWL .Sounds simple? Not when your classmates are delinquents.
A heart whelming love story of a boy (Lee Seung GI) who persevered and fough hard for his love (Yoona). The story take off from the childhood memories of the boy up to the current real time (2014), where in all the of the challenges and sacrifices of the boy will be told.