Gu Yi Bei and He 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 He Su Nan's path cross again, initially carried with remorse and resentful Yi Bei, quickly 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 hides many secrets, which slowly coming to light.