There was once a man named Yan Bufan, who hid in the city and helped the suffering people and was loved. According to rumors, he was good at astronomy and geography, and was proficient in exorcism and catching tricks. He could see what ordinary people could not see and judge the unfair things. He was called Yin and Yang Master. Yan Bufan was invited to the Lin family's house to solve a problem. When he entered the door, he saw a row of "ghost footprints" on the ground extending forward. Following the introduction of the housekeeper of the Lin family, Yan Bufan also followed the footprints and began to solve the "ghost matters" of the Lin family.