Someone help please

I forgot the title. But someone might know this. Its about a girl that has some little power. And the brother has power too. But the brother is a bully to the fl. Whenever the brother has his power thingy around her one touch and it would be gone. But they know that she doesnt have power. So theyre shocked. And the male lead is very powerful so the father doesnt like him. They lock her up in a old dusty dark room. So the male lead takes her to his house to stay there.