Which novels had male protagonists who were adopted sons of female protagonists?

In the beginning, the female protagonist liked the second male lead, but the second male lead was sent to the female protagonist by the male protagonist from the future. The purpose was that only by sending the second male lead to the male protagonist would there be a male protagonist. Later, the second male lead died, and the female protagonist adopted the male protagonist as his adopted son. The plot after that was not very clear.

Answer 1

"My wife at a sky-high price."