Scholar Who Walks The Night and The Emperor: Owner of the mask have similarities. Both story is developing the crown prince to become a great King.
It's because there is a cruel person/vampire that stand behind the Kings order and the Prince were forced to serve that person/vampire in order to keep his people save.
In The Emperor: Owner of The Mask there is Daemok. In Scholar Who Walks The Night there is a vampire called Gwi.