Huo Li originally prepared a surprise for Zhu Zhiyu on their anniversary, but instead waited for the grim news of her passing in a car accident. Three months later, deep in longing on a rainy night, he accidentally returned to his college days and saw a still-living Zhu Zhiyu once again. Huo Li, who was once reclusive and inferior, only able to gaze at her from afar, decided not to miss out this time. Starting from an accidental encounter, he walked back into Zhu Zhiyu's youth and tried to change the fate of them both. However, as the past replayed bit by bit, he gradually discovered that wanting to prevent that tragedy was far more difficult than falling in love with her all over again.