Gu Qinghan, the daughter of a poison master, became a handyman in the general's palace after her family was wronged. She used the black jade scorpion to hide her edge, and used her poison skills to frighten away bullies and track down enemies. Later, due to scorpion poison, she entered the palace and used poison to detect the concubines' schemes and save the prince. She gradually counterattacked from a humble servant to the cold concubine who mastered the palace's poison skills. She used the scorpion as a blade to exact revenge on all enemies.
