As mentioned by everyone else here, earning money on WEBTOON is really hard. The threshold required to even unlock the Ad Revenue option over there is huge; if I had that kind of following, that would be a reward in and of itself.
Ad revenue is way easier to unlock here on Tapas, but it's still fractions of pennies until your monthly page views are numbering in the tens of thousands.
WEBTOON does have a creator Patreon button at the bottom of each page you post, which is nice. By linking your Patreon to your WEBTOON account, dedicated readers can choose to flick a couple of dollars your way each month, if they wish to. That said, convincing people to sign up for that is hard. Out of a combined 300 subs between Tapas and WEBTOON, I have... one patron.
Which is still super flattering, and I appreciate her so much, but you can't just assume people will flock to drop coins in your basket just because they like your comic.
Making a webcomic should be viewed through the lens of artistic improvement and refinement of one's drawing and writing skills, unless you're already a comics pro. (In which case, the ambition to monetise it quickly is more realistic/understandable.) It's also an opportunity to build an audience who are interested in your work!
The path to becoming skilled enough to make a living from this is a long one; enjoy the journey, and don't focus as much on the destination. By doing that, the journey becomes so much more fulfilling.