In 1968, Kanchanaburi — Yak, a soldier from the elite Black Panther unit, receives an urgent mission from Major Rit: to find Thap, an intelligence officer who has gone missing deep in the jungles of Khao Kwang. The area is infamous for the legend of “Ai Hong,” a shape-shifting tiger demon said to possess immortality. Yak and Sergeant Paphan lead a team of elite soldiers into the heart of the jungle to search for the missing officer — and to hunt down the man-eating creature. But as the line between man and monster begins to blur, they must fight to survive the horror of Ai Hong and protect Nampetch from its deadly fangs.