The news that I Am Legend 2 will retcon I Am Legend’s divisive ending is great for Will Smith’s return to the post-apocalyptic sci-fi franchise. I Am Legend’s ending is one of the more controversial book changes in the history of cinematic adaptations. Based on the Richard Matheson novel of the same name, 2007’s I Am Legend begins as a relatively faithful retelling of the book’s story. Both the novel and its movie adaptation focus on Dr. Robert Neville, a lone survivor who stalks through an abandoned city years after a mysterious disease turned the human population into vampiric monsters dubbed Darkseekers.
https://screenrant.com/i-am-legend-2-timeline-retcons-will-smith-return/