Sihanbu Hwangjeui Juchiuiimnida

A woman named Serena Vincent repeatedly relives the day she is assigned as a physician to an emperor. Each time, she fails to save him and is executed. Meanwhile, the emperor, Azaid Khan Krothen, is the illegitimate son of a maid and was abandoned at birth but now rules a throne coveted by others. Serena must discover a cure for his unknown illness to break the cycle, as each failure results in her death.