Xiang Yuan, who once unsuccessfully pursued Xu Yan Shi in school, reunites with him as an adult. While she works to save a company and he struggles to follow his dream of becoming a navigation engineer, they support each other through challenges and grow together.

The quiet life of high schooler Zhao Zuoyou is turned upside down by a mysterious new student, Xun Weilai, and a strange new neighbor, Zhao Liao. He never suspects they’re both versions of himself from different times. At 16, 41, and 66, the three Zhaos couldn’t be more different — each with their own motives — and now they’re all fighting for the same life.