I Know I Shouldn’t Do This with the Duke

“After spending a night with the duke I’d been secretly pining for, I was offered a contract marriage.”
Elin, who had been steadfastly enduring the increasingly severe torment from her stepmother and stepsister, runs into her secret crush, Dominic, at a ball. While looking after a drunken Dominic, Elin ends up spending the night with him...
Meanwhile, Dominic, who must marry to secure a deal with the Crown Prince, proposes a marriage of convenience to Elin while searching for a suitable partner...!(Source: Naver, translated)