你想摸一下我的魚尾巴嗎, DWTFT (Associated Names)

The little mermaid Song Huai gets his head smashed and realises that he’s living in a book. The brother next door, whom he has always adored, is the protagonist gong in the book, and he is a standard cannon fodder shou, who not only withdraws from the marriage for the protagonist gong, he also ended…