Hana Kimi (2006)

Original title: 花樣少年少女

After watching a high jump competition on TV, Lu Rui Xi was so inspired by a jumper named Zuo Yi Quan that she decides to transfer to his school, which happened to be an all-boys school; therefore, she disguises herself as a boy to get accepted. At the school, Rui Xi befriends Jin Xiu Yi. One day during a friendly soccer match, Rui Xi is knocked unconscious by Xiu Yi. Quan carries her to the infirmary and realizes that Rui Xi is in fact a girl! However, Quan keeps her identity a secret. At the same time, Xiu Yi starts to question his own sexual orientation when he finds himself having feelings towards Rui Xi.