If there were a well in which a group of happy frogs lived, and a frog on the outside thought their lives were too poor and tried by all means to pull them up to what it considered a better world, is that redemption, or presumption?
That was a question Wang Yang had pondered for a long time, through various approaches and forms, starting from before "Firefly" and continuing into "I Am Legend," with Neville being that frog, and the group of frogs below once lived above the well.
In the original novel "I Am Legend" (1954), the infected had little change in appearance and intelligence, but exhibited vampiric symptoms, representing a "new humanity."
While Neville, immune to the virus, was researching a cure for it, fear and hatred also drove him to continuously thwart the efforts of the vampires attempting to rebuild society, making him the most detested person among the new humans.