The film tells the story of Chen Jiahui (played by Chen Kun) who has been away from home for 16 years and returns to his hometown after learning that his father Chen Weimin (played by Wang Jinsong) is critically ill, but his father hurriedly passes away without leaving a word. After receiving his father's ashes, Chen Jiahui, his brother Chen Jiaxing (played by Wang Yanhui), and sister Chen Jiayuan (played by Liu Mintao) discovered that their father seemed to hide many secrets. Later, Chen Jiahui gradually uncovered the secret about his father by exploring his father's life trajectory, and behind the secret was the knot between Jiahui and his father that remained unsolved throughout his life.