During the Republic of China, the saying of burial in Yin house was popular, and the saying "getting rich depends on Yang house, promotion depends on Yin house" was popular. The position of Yin and Yang master was even more popular because of his ability to judge dragon caves and Yin and Yang houses. Guo Yin and Yang (played by Kaohsiung), known as the "earth immortal", came to Lingshan Town to find his benefactor Zheng Weng (played by Hou Tongjiang), and discovered the mysterious rat marriage and the death of the place where Feng Shui exterminated the family hidden in Lingshan Town. Yang people live in Yin house, and the day of returning home is the night of the first seven days. Two brothers who started their business by stealing Feng Shui have been mourning for three years. Behind their true and false filial piety, there are taboos and strange stories about carp caves. Yin people return to Yang house and look for the long-haired woman in red every night. All clues involve three stories. Cause and effect are not empty, and the cycle is endless. What is the answer to the mystery behind it?