Uri Ije Moreuneun Sai Haeyo

Erich, the recently crowned emperor, and Elisha, a mysterious girl taken in by his father, grew up together in the palace, clashing at every turn. They are promised to be married, but as a child, Erich was against it. When Elisha disappears so they wouldn't have to marry, Erich wants her back. (Source: Manta)