Konyakusha ga Asu, Kekkon Suru Sou Desu.

Overview

The abandoned heroine finds doting love! A Cinderella story filled with happiness! Lane, who lives in a small village far from the royal capital, hears that her fiancé, who left her five years ago, is marrying a saint. Having given up on the idea, she doesn't think much of it. For some reason, he wants to invite his childhood friends to the wedding. Unable to refuse an invitation from the royal castle, Lane ends up attending the wedding of her fiancé and the saint. She heads to the royal capital with a gloomy heart, but meets someone and her destiny changes drastically. Lane, who has been in misfortune, finds true love in this happy-ending romance. (Source: Futabasha, translated)

Source: AniList