On the eve of his graduation, Ye Fan finally finds the courage to confess his feelings to Tao Tao, a young girl with whom he has been secretly in love for several years. However, a tragedy tears them apart: Tao Tao dies in a car accident. While tidying up his girlfriend's things, Ye Fan finds an old cell phone that allows him to reconnect with the past. He then sees the opportunity to prevent the brutal end of Tao Tao and their love story.