Because of a prediction by a fake fortune-teller, Ya No had to pretend to be a boy her whole life. One day she accidentally saves the boss of the Zi Fen bandit gang and his sister. As a token of gratitude, this mafia boss offers Ya No to become his brother. Seeing her hopeless situation, the girl agrees. Needing a job, she accepts the offer to become Zi Fen's assistant. However, beside her so-called brother, Ya No felt like a woman for the first time in 26 years. What will she do now?