The Return of the Su

Qin Lang was originally a cultivator named Huixian Zun in the cultivation world. As long as he crossed the Huixian tribulation, he could become a Saint.,When Qin Lang was released from prison, his father Qin Chuan was already terminally ill and his mother Ren Qing was forcefully taken away by people from the Ren family in Shangjing. The once-mighty Qin Group was left in the hands of this vicious cousin alone.,The doctors in this world can't cure this poison. Who is it, and what kind of grudge do they have against their father to inflict such a deadly blow。