Read What It Means To Be You? Manga:
In exchange for clearing off the royal family’s huge debt, Princess Violet was sent to marry Winter, the duke’s illegitimate son.
 
“I’ve never seen such a wonderful man before in my life.” Although Violet fell in love with her husband at first sight, their arranged marriage was destined to fail from the beginning.
 
“If it were e more.. asy, I wouldn’t have come here. Just this once together…..”
 
“Do you realize how much money has been moved while you’ve stood here, wasting my time?”
 
Three years later, Violet wasn’t sure such a busy man would even bother to attend her funeral. When she decided to end it all…
 
“What’s going on….” Violet blankly stared at herself in the bedroom’s full-body mirror. The person staring back at her was her husband, Winter Blooming. Why did they switch bodies?
 
 
“I guess I’ve really gone crazy now.”