Aekbaji

The only child of a prestigious family. A precious son is born with a misfortune. The fortune-teller they found for their son is Ran-Hui, born with the so-called "fate of noble birth." At the age of fifteen, Ran-Hui becomes Baek-Hyun's fortune-teller, absorbing his misfortune with every fiber of her being. She grows weaker by the day, finally absorbing the last of the misfortune and dying in Baek-Hyun's lap. But what happened? Ran-Hui, who was clearly dead, has come back to life. Everything is thrown into disarray by the discovery that she, who should have died, is alive, and now Baek-Hyun's wife. And finally, she discovers the secret Baek-Hyun has been hiding...

(Source: Naver Series, translated)