Help remembering manhwa's name?

[KageLycan]

I'm trying to find a manhwa/hua that I read before but it seems I didn't bookmark it. I can't remember if the FMC was reincarnated or what but the story went along the lines of the Duke's son (? I could be wrong but he's high nobility) has feelings for FMC but his older sister prevents him from meeting FMC and schemes against her. I believe the son has dark blue hair. The story might be villainess but not sure.

 

[MawMaw]

@KageLycan
post on the manga forum bro

 

[KageLycan]

@MawMaw Ah, sorry first time posting anything in here.