李献计是一位患有“差时症”的病人，一直以来，他被这种奇特病症所困扰，与整个世界格格不入，直到他遇见王倩。然而，一场突如其来的意外打破了二人平静幸福的生活，无法接受现实的李献计再次陷入了差时症的漩涡当中..

Lee suffers from Time Perception Disorder (TPD), a rare psychological illness that makes one unable to judge the length of time. Lee holds a boring job and his biggest interest is to play video games. That is a hobby inspired by Lee’s uncle, who left Lee a mysterious video game disc. His uncle claims that anyone who beats the game would open the door of time travel. Lee’s life dramatically changed when Wang Qian steps into his life. Wang Qian also suffers from TPD so she understands Lee more than anyone else does. Their romance blooms and the two decide to be together. Unfortunately, tragedy strikes and the happy days end abruptly. Wang Qian is killed in a traffic accident after Lee quarrelled with her. Lee’s world collapses. Feeling extremely guilty and desperate, he suddenly comes up with a crazy idea: Beat the video game his uncle left, open the door to time travel and save his girl. From that point on Lee embarks on an amazing journey.

리는 시간을 제대로 느낄 수 없는 병을 앓고 있다. 특히 지나간 옛일에 대해서는 혼란을 일으키는 특이한 병이다. 병 때문에 홀로 따분한 삶을 살고 있던 리는 같은 병을 앓고 있는 왕 치엔과 만난다. 이내 사랑에 빠져 행복한 나날의 그들에게 큰 파국이 찾아온다.