Sunset at Chaopraya 1996 on netflix

Angsumalin, the beautiful daughter of a military leader, says good-bye to her friend Vanus, who is going to England to study. She won’t promise to marry him, but will give him an answer when he returns. The Japanese invade, and circumstances bring Angsumalin together with Kobori, an idealistic Japanese captain, who is also related to a powerful Japanese general.