The child is his father's biological child, and the male protagonist has been married once. The third elder brother in the novel about raising a cub (the heroine and the cub are also good, a bit similar to the xiaoma literature)
I suspect that the heroine is a kindergarten teacher and has studied child psychology. An Xiaoniao in the article about raising cubs (full marks for professional skills)
The early stage is better, the child is not the male protagonist's biological child, the fake son is really a nephew. Concubine Qi in the story about raising cubs (looks good in the early stage, but not so good in the later stage)