A brief description of the manga Win Over the Dragon Emperor This Time Around, Noble Girl!
Jill was sentenced to death by his own fiancé, the crown prince. But the girl was given a second chance. When time turned back, she found herself again as a ten-year-old girl, on the very evening that her engagement was decided! Deciding to outsmart fate and avoid death, Jill hastily proposed to the man behind her, but it turns out to be none other than Hades. Hades is the emperor of a neighboring kingdom, who will soon be possessed by darkness and become the worst villain.