Backlight Lovers (2013)

Ke Zhong and his buddies Zhen Feng and Ming Da are caught by Lin Da who is fed up with their practical jokes around campus, and their university punishes them by forcing them to join a charity bike expedition to help families in need around Taiwan, organized by Lin Da. Lin Da invites along An Jie, a shy girl who becomes her friend after she defends her from bullies. At the end of their journey, they promise to meet up in three years.