Lin Xiao has been secretly in love with the cheerful and handsome Yang Xi since high school. For Lin Xiao, Yang Xi was like a beam of light shining into her gloomy life. During college, Lin Xiao and Yang Xi became lovers. At this time, a boy named Qi Heng also broke into Lin Xiao's world, and her sister Lin Hua became Qi Heng's father's girlfriend. Later, due to various misunderstandings, Yang Xi left for the United States without saying goodbye, while Lin Xiao waited there with longing and pain. The one who always stayed with her was Qi Heng, who seemed to be a playboy. Five years later, Yang Xi returned to China and re-entered Lin Xiao's world with a new identity. The former lovers met again, and the throbbing and heartache began again.