I Became the Villain's White Moonlight

Everyone believes the "mad" young emperor keeps the Tu family's legitimate daughter close only because she resembles his lost white moonlight—a cruel game of substitution. But Tu Yaoyao knows the truth no one will believe: she IS his white moonlight, the one he's been searching for all along. As he showers her with obsessive devotion and guards her jealously from the world, she can only sigh at the irony. How do you convince someone you're not a replacement when you're actually the original?