1941, along the coast of Chumphon Province, Thailand. Mok (Awat Ratanapintha) leads a group of young soldiers to fight against the invading Japanese army. However, the situation becomes more complicated and dangerous when the enemy releases a deadly biochemical virus on the coast. Mok's brother Mek (Nonkul Santinatornkul) is an army officer stationed nearby. When the Japanese lost control of the biochemical virus, Mek was ordered to cooperate with the Japanese army. But Mek soon discovers that this mission may require him to kill his own brother himself.