Sihanbu Hwangjeui Juchiuiimnida

Executed for failing to save the emperor, Serena Vincent wakes up again and again on the day she’s assigned as his physician. Azaid Khan Krothen, the emperor's bastard son from a lowly maid, was cast aside at birth. But he now sits on a throne others want to control. As Serena races to cure his mysterious illness, each failure ends in her death. Trapped in a deadly loop, she must find the cure to the emperor's illness... before her next death is her last.(Source: Tapas)