She is a mysterious woman with an unknown identity, but her original intention has not changed in this apocalyptic world. He is a criticized illegitimate child who has become a master under pressure. When she met him, the gears of fate began to turn ruthlessly. He and she were like masters and disciples, like friends, like enemies, and like lovers. She pulled him up when he was in the most difficult time, and pushed him into the abyss when he needed her most. What is hidden behind all this? Is it love? Is it hate? Or is it wolfish ambition?