Gyeongseong Creature: The Unwithering Flower 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 spin-off webtoon series, set against the backdrop of Manwoldo, where another human experiment took place, will narrate the story of Geum-ran, who, instead of turning into a monster through the same experiment, transforms into a powerful being with human intelligence.