So if I remember it right it was a jp romance novel where the mc reincarnated as a crown prince?(I'm not so sure)and he fell in love with the villainess.I think the poster was like a blonde guy sitting next to a girl with black hair and red eyes and she was in a hat and red dress?Does anyone know a novel like that? TYSM
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This, but to answer your question, I think it's Observation Record of a Self-proclaimed Villainess’ Fiance
I don't think its that one since this one has a manga while the one I'm looking for doesn't have manga I think