Shu Hai is the ugly duckling geek, cheering by friends who try to gladden his life and lift his spirits up to no avail since Hong Pei. While joining in the Special Cosplay Tournament, he encounters the popular coach Chang An and gets debited for a taekwondo training course that he has not subscribed for. Shu Hai decides he will get his revenge from Chang An, a man who is not exactly what he seems.