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, and giving me ivory from the southern lands and silk clothing. Whenever he asked if I wanted anything else, I would only shake my head in response. Normally, he would understand and turn away, but today, he gazed at me vacantly. When I approached him, asking what was wrong, he laid his head on my shoulder lifelessly. "Why do you lie to me every time?" He lifted his hand slowly and grabbed ny wrist. "Why won't you tell me..." He spoke desperately, as though he would fall apart at any moment. "...to save you?"