The 24th Fiancée is the Charm

Also known as: Konyaku Haki 23-kai no Reiketsu Kikoushi wa Inaka no Ponkotsu Reijou ni Furimawasareru, 婚約破棄23回の冷血貴公子は田舎のポンコツ令嬢にふりまわされる, 23번 파혼한 냉혈 후계자를 길들이는 법

by Tsugikuru, Tamako Tamagawa

Adonis, the only son of a marquess, is blessed with a handsome face, exceptional intellect, and a respectable family. However, his terrible personality has caused 23 noble ladies to break off their engagements with him so far. In a desperate attempt to find someone who won't end the engagement, his mother chooses Ophelia, the daughter of a poor country noble, as his 24th fiancée. But Ophelia's bright personality and honesty soon melt the hearts of everyone in the marquessate, including Adonis himself... (Source: Pocket Comics)