In the summer of 1983, Xie Shanhu, back in his twenty-year-old body, seizes an opportunity to get a job at a sugar factory. With Lin Wenwen's help, he leaves behind his aimless former life and gradually becomes a security officer. Drawing on his experience from the future, he outmaneuvers his rivals and handles one difficult incident after another, earning commendations for saving lives. While investigating an old calligraphy copybook, he accidentally becomes entangled in a mysterious affair involving an ancient tomb at the docks and uncovers the schemes hidden behind it. Amid the sweeping changes of the times, he works hard and steadily, step by step transforming the course of his life.