Xia Xu was admitted to Shen Yunxi's school, but her family was not here and she needed to move, so she stayed at Shen Yunxi's home. After that, Shen Yunxi gradually developed subtle feelings for Xia Xu.
Later, when he went to college, Shen Yunxi asked a friend to tell him something for him, but his friend knew that Shen Yunxi liked Xia Xu, so he confessed to Shen Yunxi on his behalf, but he was rejected.
This conversation made Shen Yunxi know that Xia Xu had someone he liked, so he decided to stay away from him.
But then he encountered an accident and passed through Shen Yunxi in parallel time and space.
Do it again to make up for your regrets.
This time Shen Yunxi finally understood Xia Xu's thoughts.
Intention: Love life with the person you like. See the world clearly with people you don't like. The person to love is yourself.