1941: In Chumphon Province, Thailand, Mok (Awat Ratanapintha) and his ragtag unit of young soldiers are thrown against the invading Japanese forces. The invaders bring with them a terrifying biological weapon, but it has plans of its own.
Mek (Chanon Santinatornkul) is Mok’s older brother, an NCO serving close by. Mek is ordered to join forces with the Japanese when they lose control of their weapon, but finds out that his mission could mean the death of his own brother.