Hidden in the old city, strange murders occur one after another in the mysterious street with rules. Others dare to stick to the rules to save their lives, but the poisonous doctor Zhuli relies on his familiarity with various medicinal properties to see through the flaws hidden in the rules. Did she meet the thoughtful and sinister police officer Qi Yan? No, Qi Yu, the two of them worked together to deduce the loopholes in the rules layer by layer, uncover the secrets behind each murder case, and tear off the false mask that the Guitan District has been disguised for many years.
