She is the cold-hearted and good-for-nothing senior sister in the Cloud Immortal Sect. She looks calm and gentle, but in fact she carries the system's missions and kills people like flies. She is the real culprit behind the sect's serial murders. He is the sect leader's most promising disciple, a genius in cultivation, aloof and ascetic. Ordered to investigate the sect's murder case, he's never expected that his heart would race inexplicably when facing her. As the long-sealed secrets of the sect gradually revealed, the bloody truth is finally uncovered, and he has to make a choice.