The Terminally Ill Side Character Inside of a Martial Arts Novel

I became a side character who was the younger sister of the male lead in a martial arts novel. Not only that, but I was sold off to the demonic cult for my family's sake where I met the young master, Hyuk Dojin.He would asked me everyday if I wanted anything from him and my response would simply be a no. However, despite my answers, he would gift me many things like sending money to my family, buying me jewels, an...