She thought her youth was incomplete, and her heart would be broken if she fell in love with the wrong person, but he thought her youth was complete, and only when she falls in love does she know what is true. He would always approach cautiously, and would retreat to the corresponding position after a moment of alienation. He always thought that he could still be confident in front of her, but he didn't know that the world is like this. The more you care, the more uncertain you will be. He waited for her for many years to let her forget the past, because she didn't need to worry about the future. She later realized that she would be so happy if she married him, and she didn't have to be so coy at first.