Pls bring me back my fav ship

Someone help me find this fantasy manhwa.
It wasn't bl but it certainly was baited to be one
The mc was transmigrated into a game or a novel idk but he was in this world where he'd have to act as a duke's (I think) assistant and like the duke was smart and very serious. At first they are awkward and don't get along too well. The mc was trying to spare his life and be the most trustworthy assistant cause in the original novel or game he was a disloyal assistant and betrayed the duke and he was killed gruesomely by the duke's own hands.
The duke had white/blue pastel long hair I think and glasses while the mc had brown short hair still not sure about their appearances.
At first I thought it would be bl but it wasn't but it was genuinely so sweet how the mc came to be the only trustworthy person for the duke and how he would do anything to protect him. They shared an office and while the mc pretended to love work he hated it but they would share cookies and tea.
They were my favorite ship back cause it's been long since i've read it and I didn't finish it, I wanted to know if they got together or not.