Chen Wen, the owner of a Feng Shui shop in Bangkok, appears to be timid and superstitious, but in fact he is a secret locksmith with a century-old tradition, guarding the last seal of the Ayutthaya Dynasty. Archeology professor Nora accidentally unlocked the ancient restrictions in the bloodline, allowing the evil spirit of the national destiny to quietly resurrect after three hundred years of silence. When supernatural events spread across modern cities and the deduction compass points to a dead end, Chen Wen must cooperate with this scholar who does not believe in ghosts and gods, and find a dangerous road that allows history and the present world to coexist amidst the hunting of hypocritical girlfriends and ambitious powerful men. The duty of a locksmith has never been to destroy, but to redefine the boundaries of the seal on the verge of losing control.