hello help please!

im looking for this bl manhwa ive read a while ago, it was royal x servant bl, the royal had blonde hair (typical ik). im not sure but i think they were childhood friends, then the servant went away and came back a few years later and the royal is still obsessed with him. i think it was a/b/o but im not sure, because i think i remember that the royal made a special perfume for the servant with hid pheromones but take it with a grain of salt since i might have messed something up.