Yan Yangyi and Bao Hulu strayed into the strange Underworld Town, where they can only enter but cannot leave. Anyone who leaves without authorization will die mysteriously. Although Yan Yangyi doesn't believe in the horror legends all over Yin-Yang Town, he frequently encounters strange things. Will he be able to survive time after time? What was even more unexpected to Yan Yangyi and Bao Hulu was that under the curse, the spooky town has an amazing secret behind it...

There was once a man named Yin XIII, who was known for helping the suffering. According to rumors, he was good at solving supernatural phenomena and knew how to drive away evil spirits. Yin saw what ordinary people could not see. One day, he was invited into the Lin family home to solve the mystery of the ghost footprints.