Nampyeonnim, Dasi Gyeolhonhae Juseyo!

As a so-called "half-noblewoman," Shurya Littenheim was shunned by all in high society except her husband, Grand Duke Kardi Esperand. So when the powers Kardi inherited from his family start to slowly kill him, Shurya gladly makes a deal to sacrifice her own life instead. Upon her death, she's reborn as her younger, single self, and this time... she's doing it all over again! Shurya's on a mission to make Kardi her hubby once more, but is there any hope of avoiding yet another tragic ending?
(Source: Tapas)
Note: The side stories are rated R19.