Hwangtaejaui Sokkupchinguro Saranamgi

A girl named Ella discovers a weak, ill boy in a cave and takes him in, using an unusual healing ability to help him recover. Over six years, the boy, Carl, matures into a handsome young man, whom Ella considers a brother. Unaware of his true identity, she remains unaware that Carl is the presumed-dead heir to the Easton Empire, secretly planning to reclaim his place. Additionally, Carl harbors emotions for Ella that extend beyond familial bonds.