The male protagonist is suspected of being the "servant" of the female protagonist and cannot live without her. Even though she is with someone else, he still loves her so much. He is willing to be a third party and be a cuckold. He works hard without any regrets.
Due to the unexpected pregnancy of the male protagonist (it is not known whose child it is, it will be revealed later), he moved into the female protagonist's house. The male protagonist has a low self-esteem and is a coward, and the female protagonist is a bit scummy in the early days.
Xiang, the female protagonist is a maintenance worker, the male protagonist is a university teacher, and the male protagonist has big breasts and pretends to be a dick to seduce the female protagonist.
The hero and heroine are childhood sweethearts, the heroine is the eldest daughter, the hero is her fiancé, and the heroine is the ancestor who behaves wantonly and has a bad temper. (This book has a twist: the male protagonist was molested by a middle-aged woman in junior high school. But I personally don't care)