Hwang hyunjin is the prince of levanter kingdom, aka the heir to his father’s throne. Seungmin is Hyunjins assistant. For example, he wakes hyunjin up, tell him his schedule, etc. there are multiple servants, maids, etc in the castle and kingdom in general, but seungmin is the most trusted by the king and queen. That is why he was handed the job of being prince Hyunjins assistant.

—

Seungmin stands in front of Prince Hyunjins bedroom door and sighs, ready to be bitched at for waking him up