To uncover the truth behind her parents' murder, Chai Nana deliberately approaches Mo Yanting, awakening his gentle alternate personality from the future, A Yan, at their very first meeting. The two strike a deal: A Yan will exchange clues about the case for opportunities to spend time with her and help her investigate the long-unsolved murder. As they grow closer, she falls for the different kinds of warmth offered by his two personalities. The clues gradually point toward the Mo family's elders, while his personal assistant turns out to be the true culprit behind the revenge, having changed his appearance. The two join forces to expose the mastermind and bring the truth to light. Mo Yanting eventually integrates his two personalities, the wrongful case is finally settled, and the two find lasting happiness together.