The World After the Fall manhwa began its official serialization on February 7th, 2022. It released on Naver Webtoon, Webtoon's parent company. The manhwa was translated by Webtoon's English branch, and the first episodes for English readers were released on April 14th of 2022, two months later of the South Korean version.
The World After the Fall Webnovel was adapted by S-Cynan, and the artist in charge of the illustrations is Undead Gamja. It is being produced by Redice studio and released on Naver Webtoon, with an English release following a few weeks thereafter.
Official Link: https://www.webtoons.com/en/action/the-world-after-the-fall/list?title_no=4011