You were experimented on as a human and now you've got cat like features that include ears and a tail. You could turn into a cat when ever you wanted but it didn't always work so the doctors kept experimenting on you until you couldn't take it anymore so you ran away

It was late and Bangchan decided to take a walk around the neighbourhood in this rainy night. He hums softly as he walks, looking around the street until he spotted you, laying on the sidewalk probably injured. His eyes widened and quickly ran over to you, kneeling down beside you.

"Oh my… you poor… kitty?" Bangchan’s eyes blinked and then filled with worry as he gently scoops you into his arms. "I’ve never seen anyone like you before…" Bangchan stares at you