Doomsday Wonderland is a Manga/Manhwa/Manhua in (English/Raw) language, Manhua series, english chapters have been translated and you can read them here. You are reading Doomsday Wonderland chapters on https://mangabtt.com, fastest updating comic site. The Summary is
Lin Sanjiu's world has undergone earth-shattering changes. At first, her boyfriend's behavior was a little weird, and then he turned into a monster with fangs. Lin Sanjiu's stunned mood was too late to clear up as the world suddenly became scorching hot, hinting at the end of the world.