CEO, Let's Get Married

*After a year of cold marriage, he suddenly demanded that she must fulfill her wifely duties… 
But after forcing her to get pregnant, he had never touched her again. 
When she about to give birth, she was informed accidentally the reason he wants the true purpose of this baby, it is to save his another child!
The reason why He wanted to have children with her, is just because the woman he loved could no longer bear children... 
What happened between them? 
Who is that woman he loved?