Kim Rae-won

 Lee Da-hee

Z-O is a created biological experimental subject made by corrupted priest and scientist. His appearance is same as ordinary human, but has special powers that makes him a monster inside. To live as a human, Z-O escaped from the lab when he was young, and lived as Ji-oh, but lived his whole life being chased. Tired of being chased, and to find answer to live as human, he goes back to the lab to face the reality. However, the reality was much more cruel. He has to choose now whether to be a monster, or a god who can control humans.