The Dungeon's Dying S-Class Lady

Top S-class hunter Sin Yu-Ri helps protect Korea from the dungeons that have been wreaking havoc. And when all the hunters refuse to take on the "I've Possessed the Body of a Weak and Terminally Ill Noble Lady" dungeon, Yu-Ri and her team head inside to challenge it. But while her comrades become an emperor, a pope, and a master of the magicians' tower, she becomes a dying noble lady! They have one year to prevent the destruction of the continent, but can she help with this frail body of hers?!

(Source: Tapas, edited)