Saving the Dying Duchess

When Grand Duke Heveruth realizes he's in love, their contract marriage is already over, and Litricia has died from her terminal illness. He then finds himself traveling back in time to the day they first met, and this time, he swears to save his wife so they can live happily ever after together.

Original Webtoon:
Naver Webtoon, Naver Series

Official Translations:
English: Manta
Japanese: Comico, Piccoma