The "Baicaotang" herbal assassin organization hides in the mountains of southwest China, uses exquisite poison techniques to kill people invisible, and fakes death from illness. Jiang Wanqing, a young pharmacist, stepped into this dark whirlpool resolutely to avenge her master's tragic death. She is extremely talented and knows the properties of poisons and medicines at her fingertips, and she soon became the most popular "King of Poisonous Medicines" in the organization. However, when she received the task of preparing "terminal disease medicine", the target turned out to be the medical guru who had saved her life - Lu Qinghe! Lu Qinghe is dedicated to overcoming terminal illnesses and is the hope of countless patients. Jiang Wanqing is struggling in her heart, torn between revenge and conscience. Can she see through the fog, reveal the truth about her master's death, and rescue Lu Qinghe from the clutches of "Baicaotang"? A shocking showdown about poison and medicine, hatred and redemption, begins! How will she use poison to counterattack the darkness, and how will she face that innocent trust?
