I Spent The Night With My Soon-To-Be Ex-Husband

“that night, it was a mistake.” i was the ill-fated duchess, killed by my husband, the final villain and mastermind in the novel. a weak duchess who couldn't even do her job properly. i planned to divorce him after playing the role of a business-like, show-window couple, but i ended up making a mistake with my soon-to-be ex-husband. “do you not remember?” but from that day on, the duke started acting even stranger..? “if you think it was a mistake, let’s check. do it again.” when i came to my senses, i was already in my husband's arms. and when i realized that his embrace, which i thought was always cold, was actually warm, it was too late to turn back in our relationship. …husband, why are you so obsessed when we agreed to divorce?