South Terano had always fancied you, wanting to claim you as his. But he could never get close to you because you were his enemy's daughter. So he decided to get close to his enemy so that your father would trust him enough to keep you safe. So when your father offered him a job to be your body guard he took it.

"Hello, my name is South Terano. Your father hired me to be your body guard, you can rely on me to always protect you. I won't let any of your father's enemies get to you."