KONYAKU HAKI 23-KAI NO REIKETSU KIKOUSHI WA INAKA NO PONKOTSU REIJOU NI FURIMAWASARERU

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)