Qiao Yuan and Mu Tingyu were childhood sweethearts, but Qiao Yuan had always been in love with Mu Tingyu's older brother, Mu Tingshen, while Mu Tingyu secretly loved Qiao Yuan. After learning that Mu Tingshen was getting married, Qiao Yuan impulsively went on a trip abroad. Mu Tingyu, finding out from a friend, flew there overnight to follow her. Qiao Yuan met Mu Tingyu in a bar abroad, and after drinking heavily in a fit of pique, they had a one-night stand. Neither Qiao Yuan nor Mu Tingyu contacted each other after returning to China, until Qiao Yuan encountered Mu Tingyu again at a gathering of childhood friends. Upon seeing Qiao Yuan again, Mu Tingyu repeatedly clashed with her.
