Primal Evolution is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

The year 2045 is the era of flourishing plants. Where parasitic flowers mutated humanity into monsters in an instant. Only a few survived and constructed the underground ‘City,’ but they oppress and suppress the remaining humans as they please. Can ‘Garam’ find his brother Gaon in this chaotic world?