The humans on the surface have seen and heard of monster human hybrids, but they do understand that most of the monster human hybrids are taken from their families and put to work. Kat was unfortunately one of them. She was taken away from her sisters and parents. She eventually ran away and fell into the underground, she was amazed by all of the monsters. She felt happy for once. She already knew her joy wouldn't be permanent, she wanted it to be permanent.