Honestly, I spent way too long trying to figure this out before I read it, so I hope this saves someone the hassle. The manhwa 'Corrosive' doesn't really follow a traditional 'season' model like some webtoons do. It's one continuous run. The serialization can feel a bit segmented because of platform updates, but there's no official reboot or 'Season 2' with a time jump.
Last I checked, it's concluded, so the chapter count is final. I think it capped at around 70-something chapters? That might seem short compared to epic-length series, but the pacing felt pretty tight. There's no extended arc after the main story ends, so if you're looking for bonus material or side stories, you'd probably be out of luck.
What threw me off was the art evolution; the style changes enough between the early and later chapters that it almost feels like a different season, but it's all the same narrative thread. The ending was decisive, too, not one of those open-ended ones that begs for a continuation.