I Failed To Throw The Villain Away

One day, my father gave me a boy slave. He said he saved him from the battlefield due to his good looks. “He has a seal engraved on his heart. As long as you have this bead, he won’t be able to disobey you. So you can order him to do anything.” The boy looked rather grim after hearing what he was I ordered. Ah, was I treating him too much like a dog? As my father squeezed the bead, the boy then knelt at my feet. “Master” His red eyes flashed, illuminating his eerie gaze while smiling madly. Why is he like this to me?! I tried my best to treat him properly!