Responses
Most authors who write about "demons" usually make the main ones good. You know that too as a manga addict, don't act like authors don't usually transform devils into angels.
Even otome games have it, like Ibey Me and What in Hell is Bad.
Some more with literal devil in their title, they're usually an edger version of Sasuke.
This is one of the first times in a shoujo manga that the Male Lead is evil, you know it's true, and you also know it's rare.

...he's not hot anymore, just a fucking bastard.
Poor Crown Prince, he's such an angel.