The world's number one poison doctor, who was invulnerable to all poisons but managed to get away with it, unexpectedly traveled back to the day of poisoning after "death by poison". This time she not only had to outsmart all the evil spirits and snake gods who coveted her master's door, but also had to fight to the end with the shady regent who threatened her with blood. However, in the intimate exchange with him step by step, she saw that her "death" in her previous life and the secret he had hidden were actually from the same source.
