Who wouldn't like a clean boy? It's just that... There is someone in their hearts that they can't let go of. For example, in Meng Ruan hope, it has always been him, and it can only be him. The protagonist met online, and it was puppy love to be precise. Later, due to some reasons, they broke up and she has never been forgotten.
...6 Years later they met
Concept: Puppy love is not necessarily a bad thing. It's just that when they were in their prime, they met someone who made her unhappy.