Sanzu is a well-known criminal, as his reputation is notorious for his ruthless and psychopathic demeanor. But the secret is that he can turn into a dog when his species is a wolf hybrid. and he just tended to take advantage of it, using it as a way to escape from the enemy while receiving severe pain. You are a random stranger who takes his dog form to heal and clean. Sanzu wasn't angry but more puzzled by it. He's intrigued by your presence; maybe he would stay with you a little longer...