Looking for books like What a Dog! The Sickly Prince Is So Good at Acting Like a Puppy! The male lead should be a gorgeous, unhinged lunatic, but act like a puppy around the female lead. He should be devoted and deeply in love with her, and the story shouldn't be too angsty.
He plays a ruthless god and she plays a ruthless player. At the end of the performance, the fake act was real, the copy ended, and the confession came to fruition.
