Gu Yi Bei and Su Nan were two highschool sweethearts. However, due to a undisclosed misunderstanding, the couple break up overnight. 5 years later, now being the CEO of a large IT company, Gu Yi Bei is still unable to forget his first love. So when his and Su Nan's path cross again, he tries various tricks to get them back together. What he doesn't expect, however, is that the story behind their breakup is much more complicated than he thought, and Su Nan's many secrets are slowly coming to light.