No mistress, no car accident, just a little misunderstanding. The heroine has no particular feelings for the male protagonist, and the second heroine has no objections to the male protagonist.
Yu Xiaoan and Zuo Yi were estranged due to a misunderstanding and had no contact with each other anymore. In order to change some things, she went back to the past and paired up with her childhood sweetheart Cheng Liqing. The price of changing your destiny is - there is no such person in the world.