Su Mi, an orphan of the former Holy Clan in the Western Territory, lived among the people because of his mother's injustice. He hid in the market as a pharmacist, but was involved in the Imperial Court of the Western Territory due to a palace poisoning case. Relying on her extraordinary knowledge in toxicology and her precise understanding of people's hearts, she started from the lowest position as a handyman in Shang Yao Bureau, and worked step by step to resolve the frame-up of her eldest sister, the frame-up of the concubine, and the prince's game. In the absence of a golden finger, she used "poison to destroy poison" The strong and wise fighting method of "taking advantage of the situation" stood out from the whirlpool of the undercurrent of the palace struggle, and finally revealed the truth about the annihilation of the holy clan, helped the prince he truly loved ascend to the throne, and at the same time won himself the honor of "Phoenix Seal" that is in line with the imperial power.