The story of Kin, an orphaned boy who grew up in the secluded village of Serpa deep in the forest. He searches for his true parents while working as a guide for Kyoko, a Japanese woman who is also searching for her missing father. Along the way, Kin meets Piangmat, a determined journalist and friend of Kyoko, as well as Phupha, a justice-loving forest dweller who secretly fights against illegal arms dealers with the villagers. They all become entangled in the pursuit of a lost treasure of gold from World War II and must evade Ronin, a giant snake guarding the immense fortune.
