"Emperor's sister-in-law, do you think you are a free and happy princess?" He robbed the emperor's wife, the powerful minister's daughter Rong Yu, who was originally accused of being in love with the seventh prince of the dynasty, Shen Lu. In another country, the concubine's mother's family was executed. The Rong family was eager to clear up the relationship and took the initiative to participate in the fight for the heir apparent. The new crown prince rose to power. Rong Yu married the crown prince and became a concubine. When she heard that Shen Lu had died unexpectedly outside, she gave up her thoughts and began to sing with the prince. Unexpectedly, three years later, Shen Lu returned to the court and bloodbathed the disloyal ones. The queen was killed, the prince was deposed, and Rong Yu was demoted to the deposed concubine. But the misunderstanding back then has become a shackles. How can we change the situation between uncle and sister-in-law today?