Su Jin, a girl from Yunzhou in the Dayong Dynasty, disguised herself as a man to take charge of the family and went to Beijing to take the imperial examination in order to avenge her father's injustice in the salt tax case. However, she was involved in a deeper court whirlpool. From the turmoil of the old house in Yunzhou to the flash of swords and swords at the night banquet in the capital, she relies on her wisdom and courage to navigate the game between the Cao Gang's hidden line, the power of the imperial army and the imperial power, and exposes the shocking conspiracy of salt merchants colluding with officials and liaising with Japanese pirates. When the mystery of her gender was revealed, she refused to go into seclusion. In the name of Dayong's first female censor, she continued to walk between light and dark with evidence, breaking the officialdom's stagnation with her feminine style. From protecting the family home to settling the world, Su Jin hid her daughter's tenderness and used the unicorn jade pendant as a basis to find her own path of integrity in the chess game of power and desire, letting the truth bloom like a plum in the wind and snow.