The male protagonist thinks that the female protagonist is "Bai Yueguang's substitute", and he is hot and cold towards her, but he becomes more and more concerned about her as they get along with her. It wasn't until he saw the old necklace hidden by the heroine that he discovered that she was Bai Yueguang, the person who saved him back then - the person he had been looking for for many years, who had always been by his side. The so-called "substitute" was just a lie to himself.
