Heroine: Su Wantang, the concubine of the Su family, witnessed her biological mother being tortured to death by her aunt since she was a child. She is gentle and gentle on the surface, but in fact she is proficient in medical skills and toxicology. She secretly cultivates the power of death warriors and enters the palace as a medical girl as a concubine, trying to uncover the truth about the death of her biological mother and take revenge.
Male protagonist: Lu Chenyuan, the third prince, was feared and suppressed by the emperor due to the early death of his biological mother. He seemed to be carefree and unruly, but in fact he secretly planned to win over the ministers of the court and the harem, with the intention of ascending to the throne.
Conflict: Su Wantang got involved in the harem fight for revenge, and met Lu Chenyuan in the whirlpool of power. The two used each other to gradually fall in love, but due to their respective missions and secrets, they fell into a crisis of trust. At the same time, the intricate forces in the former harem are constantly creating conspiracy traps, threatening their lives and ideals.