Yun Qi, a modern female forensic doctor, accidentally traveled to the Miao border and was bound to the "Saving the Gu King System". She needs to capture A Lang, the master of the Red Scorpion Cave Shaodong before the full moon, to prevent him from destroying the village due to the "blood voodoo backlash". Alang is the most ruthless person in Miao territory, but he is also a corpse that Yunqi had dissected in his previous life, which makes every close contact between them full of weirdness. Yunqi disguised herself as a foreign witch to "remove the poison" and approached Alang. She used modern medical knowledge to improve the poison, but she accidentally fell into the "heartbeat poison" and would kiss Alang whenever she lied. Alang looks cold on the outside, but secretly investigates Yunqi's identity and discovers that she has the same appearance as the saint of Baiya Village who was destroyed a hundred years ago. In the process, Yunqi encountered many hilarious conflicts, such as mistakenly using the "Love-Destroying Gu" as an antipyretic medicine and causing Alang to confess in public. But Yunqi doesn't know that the system was created by Alang's late mother to let her son learn love and forgiveness. In the final battle, Yunqi used modern virology knowledge to crack the blood poison, and Alang became a "human poison symbiote" to save her. The two completed the ceremony with the "Miao wedding oath" by the poison pond. However, if Yunqi's identity is exposed, he may lose Alang's trust and face a relationship breakdown. In the end, they returned to modern times to open a pet shop, using poison to treat stray animals and continue the vitality of Miao culture.
