It Wasn't Love at First Sight

Eunjae Seo, a not-so-fortunate member of a wealthy conglomerate family, goes on a blind date with Shi-u Yun, whom her grandfather arranged for her to marry. Initially wary of Shi-u due to his bad reputation, Eunjae starts warming up to him as Shi-u confesses he fell in love with her at first sight. She ends up falling deeply in love with him. The two seem to be a happy couple, until Shi-u begins to reveal his secrets to her after their wedding.

(Source: Webtoon Entertainment)