I had a different take on this after finishing the novel. The title's pretty literal, but I think the real 'villain' shifts depending on which character's perspective you're reading from. The male lead, Cedric, is introduced as the ruthless Duke everyone fears, but his motives get peeled back layer by layer. Honestly, some of the court nobles scheming in the background felt more irredeemably nasty to me.
Cedric does some genuinely terrible things, especially in the early political plots, but the story spends so much time in the FL's head that you start seeing his actions through her lens of survival and then understanding. By the end, I was way more annoyed at the Crown Prince and his faction. They never really evolve beyond their selfish ambitions.
So, technically Cedric, but the narrative makes you question what that label even means in a world full of corrupt players.