Help me searching for a specific bl manhwaÓ⁠╭⁠╮⁠Ò

There is a manhwa where one of the male leads has long white hair and he was the bottom, the other ml has black hair and he was the top. And from what I remember it was in that old Korean time or whatever u call it and the white haired guy had a high place at that time.

Also I guess that black haired one was working for the white haired guy and he had a sword. I can't remember his job exactly. HELP ME GUYSಥ_ಥ...