Su-yeon, a Korean girl who loves Thai culture, goes on a field trip to Ayutthaya with Ruan, a junior she secretly has feelings for. But an unexpected accident occurs, causing her to end up in the body of the villainess Mae Karaket in the Ayutthaya era. To make matters worse, she now has a fiancé, Khun Meun Sunthon Thewa, who dislikes her more than anything.

"Other people get to time-travel back to the Joseon era, but I end up crossing countries?!"