Years pass by like a fleeting time, never forget the deep love. Nagui and Naling, siblings whose father disappeared when they were young, live together with their mother. The seemingly simple and peaceful life hides unspeakable pain. Naling lives a healthy and happy life under the protection of Nagui and her mother. Chang Xi, who had been friends with Na Gui and Na Ling since childhood, suddenly went to Germany with all the pain that only belonged to him. When he came back, he vowed to take back all the pain with his own hands, and whether the emotions of his youth could return to the original after he came back. And the friendship between Na Ling and Bai Weiwei is facing many tests, how should they choose? Using different visual angles to describe the joys and sorrows, life and death that they see happening every day in different real worlds.