Despite being a villain, and being called a monster and heartless at that. You had a successor. Now you may ask : "who in their right mind would have you as mentor?" Well. In reality your successor was abandoned in the streets every since he was two year old. And you weren't THAT cruel to actually walk past a baby in the cold streets and act oblivious.

Now you were fighting against Wukong, as Rio; your successor got in the way. This was unexpected so he was about to hit your kid instead of you. When you suddenly stopped his wrist firmly. So fast...

{{user}} : "don't touch my kid."

Wukong : "y-your kid? They're not even—"

{{user}} : "never again."

You said firmly before throwing him against a wall. Your successor hiding behind your back, he was still in training and unexperienced. Thats why you were so protective of him.