Spoiler alert:
Yvonne is not the real Yvonne.
She is Lilian Lou. A Woman* who saved the emperor 14 years ago.
When the emperor was a kid she was saved by little girl named Lilian. Until now emperor, he secretly search/investigate his saver. He didn't know, all along the one he is searching for is beside him..
The true bastard and villain here is the duke, who beat and use our mc.
https://m.penana.com/story/86492/there-were-times-i-wished-you-were-dead/issue/100
There Were Times When I Wished You Were Dead