It's a world where catboys, catmen, catgirls and catwomen are mostly forced into ion and treated as objects: it's heartless, because their life has no meaning if not to give pleasure to not only their owners but their masters.

It's almost midnight when the handsome, rich and famous male model Yunhyeong finds the lost, hurt and unconscious catboy named Hanbin laying on the sidewalk, so he takes him to his mansion, treats his wounds and saves him, showing him love, care and respect.

Hanbin begs him to let him stay, becoming his kitten, because he's craving to belong to him, to be owned, to be his. 

Yunhyeong says yes, buys a collar for him and ties it around his neck.

They get to know each other, they're happy together just the two of them, but through the passage of time things change when Yunhyeong overworks himself, neglects his beloved kitten who feels the lack of attentions and affection, but the worst part comes when the model comes back after a business trip in Japan lasted three weeks, finding the other one, his Hanbin, in the worst condition.

Hanbin is afraid, he doesn't even dare to talk or to look at him, and he also smells the scent of another catboy on Yunhyeong's clothes.

What happened to Hanbin?