I'm a Parasite, So Why Are You Asking Me to Save the World?

[Apocalypse + decisive and ruthless + no saintly do-gooder + villain protagonist + smart characters] At first, no one paid any attention to the disaster. It was just a simple murder, an ordinary car accident, the extinction of... an entire village. Overnight, the world changed beyond recognition. Only gradually did everyone realize that this disaster had everything to do with each and every one of them! An unknown virus of uncertain origin swept across the globe. It followed no pattern and had no discernible source. Those infected lost their reason and went berserk. Some suffered random mutations in parts of their bodies, becoming monsters capable of standing against entire armies! These people were called parasitic hosts, or parasites. Parasitic hosts: enhanced strength and speed, greatly improved recovery. The parasitic hosts are divided into three ranks. S-rank ordinary parasitic hosts: devoid of reason, they know only how to kill. SS-rank parasitic hosts: they gain a parasitic mutation or have a body part mutate, but cannot control when they turn into monsters. Sometimes they are lucid, sometimes dazed. SSS-rank parasitic hosts: they merge with the virus and can freely switch between human and parasitic-host forms. Bai Qi, a name befitting a god of slaughter. Before the apocalypse, he was a killer. Whether by fortune or punishment, he was chosen to become a parasitic host, a parasite. As the apocalypse begins, who will become king of the new world: humanity or the parasitic hosts?