I'll try my luck again

anyone familiar with the romantic fantasy manhwa where there exists a magic tower that doesn't have a specific location. it could appear anywhere in the country/empire. the tower appears where the owner wish to go, and it serves as the declaration of some sort that the tower owner is around the place(?).

I've no idea what the characters look like, but I know that the tower is black and tall, it stands out. one of the characters probably needed the help of the tower owner.