Happiness comes very quickly, and of course it goes very quickly! She, an introverted girl, lived a happy life. Her boyfriend was very kind to her, which made her once think that she was the happiest girl in the world, but God took away her happiness. Just when she was in a period of lovelorn, another boy walked into her world. This boy gave her a feeling of déjà vu. Who could this boy be? And what kind of story is happening between them? And her good friend Fei happened to like her boyfriend's best friend, but he always regarded Fei as his sister. The moment he lost Fei, he felt that his heart really hurt...