Buang Banjathorn follows the story of Praenuan, a woman who escapes her unhappy marriage by moving into her late father's estate in Chiang Rai. There, she discovers a mysterious, magical bed that acts as a portal, transporting her back in time to the Chiang Tung of the past. In this historical era, she encounters Laoperng, a charming and noble man, and finds herself caught in a blossoming romance that defies the constraints of time. As Praenuan navigates her dual existence between the modern world and the past, she must confront the complexities of her failing marriage and the dangerous political intrigues of the historical setting. The series explores themes of destiny, reincarnation, and the enduring power of love, as Praenuan struggles to decide where her heart truly belongs and whether she can change the course of history to be with the man she loves.