Ookami Ouji to Usotsuki na Kekkon

Aylin, a 17-year-old princess who marries into a neighboring country. She marries Ruslan, the third prince of the empire, whom she has never met before, in order to save her small homeland from a financial crisis. Ruslan is always a gentleman and soft-spoken to Aylin, who is always making mistakes despite her good heart. However, he has a dark side...?!