They sue me because the medicine is illegal, but if it is legal, they say I can't afford it?

The beginning is a bit angsty for the protagonist; please proceed with caution if you mind this. Chen Xuan was originally a liver cancer patient who, in his despair, suddenly activated a miraculous medicine system. With the system's help, Chen Xuan defeated his disease. After being saved, Chen Xuan wanted to use the system to help others suffering the same fate as him, but unexpectedly encountered a group of ungrateful people. After being cured, they actually sued him in court...