Dung Duang Harutai is the story of three kingdoms. Kasit ruled by King Rungsimun (Weir) is the wealthiest and most powerful but they lack a sea route, for this reason King Rungsimun had planned to politically wed Princess Munisala (Rotmey) of Thanta in order to conveniently use their water route. However if both Kasit and Thanta were to unite that would cause Puntoolat to become isolated and for this reason the three kingdoms have longed lived with suspicion of one another. Princess Munisala decided to flee in order to escape the wedding because she had heard many ruthless stories about King Rungsimun but she accidentally fell into a trap and was rescued by Prince Tiyuttithorn/ Pee Chai (New) of Puntoolat where she asked to seek refuge. Upon hearing the news of Princess Munisala's disappearance and learning that it may be linked to Pee Chai, Princess Tasika (Kwan) feared the start of a war and so she made her way to speak to Pee Chai and got kidnapped by King Rungsimun and brought to Kasit. Tasika believed she was kidnapped as a hostage in order for Kasit to negotiate Munisala's return and so she began at first to dislike Rungsimun. However Rungsimun had fell in love with Tasika at first sight and so began their love story, but things get complicated as Mina (Nok) constantly stirs up trouble, by trying to harm Tasika as she was in love with Rungsimun. Meanwhile Munisala and Tiyuttithorn also started to slowly fall in love.