Kyungsoo is 25

He works as a psychologist.

He is good at self-defense.

He is  an orphan. 

In the world he lives in there are beings that are called Hybrids.

They are half cat and half human. 

There are different rules bound to having such an Hybrid.

1. You are never allowed to abuse your Hybrid(s) in anyway. 

2. You can't claim the Hybrid as yours if it doesn't wear your collar.

3. Once the collar is off, everyone has the right to claim the Hybrid as his/her with a collar of her/his own.

Though these rules exist it doesn't mean that they aren't broken.

If you have money in this world there is nothing you can't do. 

Kyungsoo  never had an Hybrid before but things will change very soon.