Akuyaku no Mob Tsuma (※Shinu Yotei)

"What? I've been reincarnated as the wife of a villainous duke in a very popular novel...?" At her wedding to the villainous Duke (handsome boy) Klaus, Natalia remembers that she is a mob wife destined to die in her favourite novel. To save herself, Natalia tries to learn more about Klaus. But contrary to her expectations, Klaus is a very sweet and angelic boy... (From: ez manga) Original Webtoon