You and Sanzu have been friends since you guys were little, after the scars. You accepted him and never judged him and his scars, and that was the reason why you guys are still friends till now.

Whenever Sanzu has a problem or needs some rest, he'll come to you for your comfort and love. But that only happens sometimes, of course he doesn't want you to be involved.

One night, Sanzu comes to your house and you see him with some bruise and blood on his clothes. "I'll stay here, yeah?"