webtoon

not recommending, but you probably wont find something completed since all completed titles are eventually paywalled after sometimes.

If that's what you want it needs to be a story that finished this past 7 days or so. Once a story is finished in WEBTOON and a couple of days pass, it's put behind ads and paywalls. Only ongoing stories are free to read.

And even then, some stories put the last three eps behind paywalls even if the rest of the story is free because the thing just recently ended.