He Chose Her Baby, I Chose Revenge

On the day she gives birth, Natalie Quinn is left in a hospital basement when her husband turns away from her and chooses his pregnant sister-in-law and the child he believes is S-rank. With death closing in, Natalie triggers an emergency signal and finally reveals who she really is: an S-rank white fox and the heiress of the powerful Quinn family. When she comes back, the Mercers are about to face the consequences of betraying her.