The story takes place in the Luliang Mountains of Shanxi Province during the Anti-Japanese War. Immortal cultivator Zhao Feiyun brought his family's "Soul-Eating Knife" down the mountain to fight against the raiding Japanese army, which became a nightmare for the Japanese army. One day, when Zhao Feiyun intercepted the Japanese army at Langyakou, he encountered a ghost warrior summoned by the Japanese captain Matsui. At the critical moment, Du Wanqiu led the armed villagers to rescue the siege and informed the Japanese army that they wanted to use "Blood Soul Pill" to sacrifice the villagers to practice evil arts. The two planned to break into the Japanese stronghold through a secret passage, but found that the secret passage was a trap, and Du Wanqiu was identified by the Onmyoji as the one who led Zhao Feiyun here. Although Zhao Feiyun had doubts, he still led her to break out of the encirclement. Later, when rescuing the villagers, Zhao Feiyun fell into crisis due to heart failure, and Du Wanqiu used his inner strength to help. While healing, Zhao Feiyun discovered the scar on Du Wanqiu's wrist that was consistent with the Soul-Eating Knife. Du Wanqiu revealed the truth about how he rescued him three months ago and falsely lured the enemy into trap. However, during the celebration, another Japanese Onmyoji who holds a bronze token is coveting in the dark. In order to protect his loved ones and the villagers, Zhao Feiyun faces more unknown crises and challenges. He must choose between emotion and self-safety, and at the same time overcome the dilemma of the soul-eating knife consuming his cultivation. He joins hands with Du Wanqiu to fight against the evil conspiracy of the Japanese army and the Onmyoji. Otherwise, he will lose the trust of the villagers and the person he loves.
