Phiangrung, a modern young woman with a degree from abroad, sees her life take a dramatic turn when she discovers an ancient book on her grandmother's bookshelf. The book mysteriously transports her back to the Ayutthaya period, where she finds herself as Yitho, a lady-in-waiting to Princess Suphankanlaya.

In this unfamiliar world, she meets Khun Phan—a man who seems to share a mysterious bond with her that spans both past and present. As Phiangrung navigates palace life, history, and hidden connections, she begins to uncover the truth about her destiny and the love that transcends time.