(you) Seo Minkyu

​You work as a Zoo keeper in 'Exzoo Planet'. You love nature and everything that's God given. Your house is a zoo. Because you really love animals you bought different kinds and take care of them all by yourself. You pretty much already look like an animal. 

Your father is a genius underground scientist, he created and discovered new things on his own but doesn't share any to the media because he knows how stupid people react to new discoveries, he knew people would not care for its values and care only about how 'cool', 'amazing' and 'un-normal' it is. He died just a year ago while your mother died 2 years before your father did. She died due to too much laughter, she was so happy back then that she forgot to breath and, unfortunately, died. Your parents are both deceased so you live independently...well not really because you live with your animal friends.

   (Kai) Jongin the Caveman

This guy is from the past. Your father once created a time machine to go back to the past and get a "homo-something" there. As a result, he caught Jongin and instatly brought him back to present times. He experimented on him and changed his linguistic skills from mammal speaking gibberish to our generation's language. Your father planned a lot for this guy but hasen't been able to accomplish them all since he died not long after he caught Jongin.

This caveman woke up 14 months after your father had experimented on him.   

PS: When he woke up he don't look like this yet, he still looked like those "homo-monkeys" with a lot of hair. (lol)