TWSA is short for Three Ways to Survive the Apocalypse, also known as Three Ways to Survive in a Ruined World and Ways of Survival, it's a webnovel in the webnovel/manhwa Omniscient Reader's Viewpoint, while it's referred to as TWSRW/WOS in the webnovel I chose what the webtoon/manhwa called it as it's shorter and is what it's referred to most often by the fandom

Also because way back when Neospring was called Sparkler and just opened to the public it only allowed usernames as short as four letters, would've took the username ORV, KDJ, or YJH if that wasn't the case haha, we also didn't have the username change feature until after we were allowed to take three letter usernames so since I had already done a lot by then it didn't make much sense to change accounts just to have a shorter username, plus those usernames were taken by the time username change was out

TWSA was good enough, as a Kim Dokja kin I feel as much connection to it as I currently do to ORV