In order to investigate the disappearance of his sister Lin Yue, Lin Wan (metaphysical forensic doctor and holder of the Millennium Yin-Yang Eye) was transferred from the Provincial Forensic Center to the task force responsible for the "Rules and Strange Cases", and formed a team with Lu Chen (rational criminal police officer), Zhao Xiao (hot-blooded policewoman), and Li Ran (technical geek). The early cases were characterized by "single rule death" (such as "don't look back" in the morgue, "don't hang the red curtains" in the ancient house). Lin Wan found "non-physical damage traces" (such as cervical spine distortion caused by resentment) through autopsy. Combined with the yin and yang eyes to empathize with the deceased, he gradually unlocked his sister's tokens (peach wood hairpin, diary fragments, jade pendant with the word "shou") and memory fragments - the story behind The "observers" (Yinsi sect, Shufa sect, and Belief sect) are collecting resentments and want to catch Lin Wan and sacrifice them during the Ghost Festival to resurrect the "Lord of Resentment" that has been sealed for thousands of years by the Lin family.
The team got involved in the main plot by solving unit cases: Lu Chen revealed that his sister Lu Yao had teamed up with Lin Yue to investigate the murder of a rule-abiding person; Zhao Xiao learned spells from relatives in the ancient town and became an assistant in metaphysics; Li Ran broke the technology system of the magic sect, and his father Li Jianguo (a journalist who faked his death) provided key clues. In the mid-term, three factions of rule-abiding people started sacrificial rituals in an abandoned church. Lin Yue was regarded as the "first container". Lin Wan was caught in the dilemma of "destroying my sister and stopping the sacrifice" or "saving my sister and destroying the whole city". In the end, he used "three factions' boss blood + thousand-year-old peach wood" to break the situation, but lost part of his memory.
In the later stage, the new villain Lin Xi (the second container of the Lord of Resentment) appeared on the scene and used the resentment of sea water to commit crimes. Lin Wan regained all his memory and awakened the "complete yin and yang eye purification ability" to defeat Lin Xi.
