i think it's a manhua
The setting in 1st chapter is a kind of library MC is currently working. And ML came with his boss(i think) looking for something. It's their first meeting after years i guess. This is the only thing i remember
The coloring is kind of dark and muted. pleaseee help
i can't remember the title. it's a smut. FL is being adopted into a rich family and to be married off to some royal someone. She's currently taking lessons from ML who's posing as piano teacher.