It's a webcomic called The Gamer, and the RSS link is here: https://www.webtoons.com/en/fantasy/the-gamer/rss?title_no=88

It's about a guy who accidentally got magic abilities and turned into a video game character, and the world around him became similar to a videogame - people started having stat blocks, special abilities and other stuff. It's originally Korean, but is translated to English and some other languages.

P.S. While writing this, I discovered my Micropub client doesn't have a field to set the in-reply-to property. I edited the JSON manually to include it. I hope you get a webmention!