PLZ HELP ME FIND THIS I'LL DO ANYTHING

HI PLEASE HELP ME I'LL DO ANYTHING, there was this one yaoi manhwa that i kept in mind to read, unfortunately i forgot the title. The other main character has black hair and wears glasses, the other one has blonde hair almost the same style as the uke of blood bank. The black hair with glasses is working for the blonde hair as a servant, assistant (i think). And no it's not Duke's private tutor, at first i thought it was a vampire story but idk i don't think so. The black hair with glasses doesn't really care abt anything, he's
serious-looking while the blonde is an asshole and likes to fool around (depending on the looks, I'm not too sure.) it's 3am rn (I'm in Asia) and I'm going insane, it'd be a BIGGGG help to my mental health if you guys help me!! <33