A group of adventurous tourists discovers a chilling secret within the walls of the Haunted Jail, where Zhang Zhen's Primal Ghosts are said to roam, leading to a nightmarish encounter with the past....

A group of friends uncover a dark secret within the walls of the notorious Haunted Jail, where the line between past and present blurs, and their lives are forever altered by the chilling revelations they uncover....