Within the Immortal Sect, inner demons are at work, and disciples die suddenly one after another, making people panic. Su Qingyuan, a low-level spiritual planter, unexpectedly discovered that the spiritual plant she cultivated could sense the good and evil in people's hearts and issue early warnings to those with malicious intentions. By chance, her spiritual plant blocked a fatal assassination attack by Lu Shiyan, the Immortal Sect's law enforcer, and her special ability was discovered by Lu Shiyan. In order to find out the truth about the "inner demon", Lu Shiyan included Su Qingyuan into the investigation team. With the help of Lingzhi's early warning and tracking, the two of them, one cold and one hot, one martial and one literary, gradually discovered that the so-called "inner demon" was not a natural disaster, but the result of the demon leader Mo Yuan pretending to be an immortal and secretly absorbing the spiritual power of his disciples. They must reveal Mo Yuan's true face and protect the safety of the Immortal Sect before his conspiracy succeeds.
