In which novel was the male protagonist suffering from heart disease, often bullied, and became very powerful after accidentally taking a pill?

The general plot was that the male lead was very weak at first. He had congenital heart disease and was always bullied by others. Later, he was beaten by gangsters and had a heart attack again. He ate a pill made from the dregs of an immortal pill and became very powerful. In the end, his girlfriend died while fighting with the underworld. That's all I can remember. It seems that there's someone called Zhuang or something who's following the main character. There's a guy called Brother Fei in the underworld The novel belongs to fantasy and supernatural At the beginning of the novel, there was a cultivator who ascended. Before he ascended, he refined a furnace of pills. The dregs of the immortal pill formed a small ball, and the old man who ascended casually threw it away. The male protagonist had congenital heart disease. Once, the gangster wanted to violate the girl he liked. The male protagonist fought with the gangster and was beaten very badly. He just happened to have a heart attack and wanted to take medicine. The medicine was knocked away. The gangsters did not want to kill him, so they went to look for the medicine. In the end, they treated the small pill with the elixir dregs as a medicine to treat heart disease and fed it to the male protagonist. After that, the male protagonist slowly became awesome. At first, it was a fight with the school gang, then it evolved into a fight with the city's leading gang, and finally, it was a fight with an evil cultivation organization. He remembered that the woman the male protagonist liked had died. The leader of the gang was called Ge Long, and the younger brother was a gangster who flirted with the girl the male protagonist liked. He was called Ge Fei, and there was a guy called "Zhuang something" who followed the male protagonist. He was quite good at fighting. There was also a guy with glasses who seemed to know quite a lot about computers. He was also quite weak. There was also a policeman who hid in the school to eliminate the gang. Later, he met the main character.