It's a bit of a joke (don't criticize if you don't like it). The female protagonist looks very similar to the male protagonist's first love. They were mistaken for it in the early stage, but after getting to know each other slowly, they found that the heroine and his first love are completely different. The female protagonist is abused in the early stage, and the male protagonist is abused in the later stage. The ending is HE, double sex.