Ye Rongnu disguised herself as a man for twenty years, became the Prime Minister, and guarded the country with an iron fist and resourcefulness in the court. When the new emperor ascended the throne and liquidated his old ministers, she let her long hair down in front of the palace and confessed three major sins - deceiving the emperor, disrupting the government, and ruining the life of the emperor's biological mother. When the government and the public are in shock, she must uncover the dust-laden truth: her father's injustice, the death of Concubine Jing, and the grievances that have been entangled with the royal family for half her life. This is the story of a woman who overcomes obstacles in a male-dominated world and finally uses black hair as a blade to pierce Chao Zuna.