During World War II, Japanese soldiers set up bases in Thailand to fight the war. The Thai government had to give in and cooperate with Japan. However, many movements arose to resist the Japanese army in order to protect and preserve Thai identity.

A Thai intelligence officer infiltrates the enemy's military forces of Chiang Riang by assuming the identity of a murdered colonel who was also a double agent. The murdered colonel, married to Lamduan, worked for the government's Central Bureau while also being an informant for Red China and working to help the local People's Army.

The film tells the epic life story of Duangjai, a northern woman who falls in love with Kritsada, a handsome and high-ranking military officer from the city. She gives him a brass ring as a token of her love. But suddenly, Kritsada disappears as World War II rages on. Pregnant and heartbroken, Duangjai decides to embark on a long journey to search for her lover. Along the way, she encounters various people and experiences that shape her life.

In 1765, at the end of the Ayutthaya period, at a village in Suphan Buri. The villagers live in peace. Despite the news of the war from Angwa, they thought that the Burmese army is not convenient for marching and make a war in flood season. With Unawareness of the Thai people, the Burmese army was able to easily invade Suphan Buri. The moon survives by disguising himself as a man, while many village women have been raped by the Burmese army. Duangjan's friend is dragged to Mangratho (Suthat Intranupakorn), a right-wing commander, but is saved by Mangrai (Pairoj Sangwaributr), a left-wing commander who is the son of Mang Mahasuranat (S. Asan Chinda), the general who commanded the army this time. Mangratho fights with Mangrai and is defeated, therefore he have a great malice toward Mangrai.