The two protagonists come from different world lines and are reborn in the same world line due to an accident. Ning Xun was reborn back to the time before Men Leng committed suicide, while Men Leng was reborn back to before Ning Xun's car accident. The two of them were on the same world line and carefully avoided accidents in their previous lives. In this life, they lived a happy life.
Purpose: Not every time you meet, you will remember it, so meet more often