Im looking for novels with naive/dumb/dense female protagonists or male protagonist(if it's a BL) and Smart or black belly/manipulative male lead. I got tired of the overpowered protagonists being all ultra beautiful/handsome and with this IQ of 400 plus being either emotionless or vengeful. I am looking for romance novels, but it could also be just a side plot. So far I've only found 1 with this plot, -Little Prodigal Alliance Head and Cook
Reborn as My Love Rival’s Wife I don't know if you already read this one, probably you did, since it's quite famous. I don't really have smthing that really match what you want, im sorry But what i recommend is very close