Kao wa Konomi desu ga Rikonshite Kudasai

Frede, the most handsome bachelor of the empire is marrying Ayla, the only daughter of the powerful duke and a notoriously selfish woman. As much as he is unwilling, Frede is caught off guard when Ayla, who had been swooning over him, offers a deal to end the marriage after one year. Confused with her change in heart and softened attitude, Frede now struggles with a growing urge to stop the fated divorce.
(Source: Pocket Comics)
Note: First released in English, with the initial eligible release in Japanese followed by Korean, making it a manga by our standards.