When Lin Xi Chi loses an arm wrestling match against her school friend, Xu Fang, the forfeit causes her life to fall apart.

Xi Chi and Xu Fang meet again at university where they make another wager on an arm wrestling match.

Xu Fang promises Xhi Chi's brother that he will take care of her, but teases her instead. When Xi Chi loses another game, her forfeit is to ask one of the archery team members for their number.

After attacking Xu Fang, the entire campus misunderstands it as Xi Chi showing him affection. Meanwhile, Xu Fang and Xi Chi continue to escalate their attempts to get revenge on each other.

Xi Chi learns from her brother that Xu Fang has been looking out for her all this time. Meanwhile, Xu Fang starts to feel jealous of Xi Chi's apparent feelings for a senior student.

After a childish fight instigated by Xu Fang's jealousy, he miraculously wins over his teammate, who promises not to pursue Xi Chi.