Hayoon, 21, is a young adult. Her mother is a mafia leader and to expand their territory, there's a marriage arrangement put in place. Hayoon has no choice but to marry Lee Donghae, the son of another mafia boss. But, when Hayoon's mother is murder in the streets of Seoul, Hayoon becomes the leader of her family's mafia. And she wants revenge, how far will she go to avenge her mother's death?