They like that comic so they want to cheat it to the top. They may also want to feature it soon but it's not popular enough. In their section about how to be feature they say the comic they chose to feature are 70% based on popularity. So they gotta make that comic reach a high popularity so that when it gets feature they can say their choice is based on popularity. but we all know it's fake popularity
About sub Zero, I've observed that comic, I must say it has a great story and art but let's be honest, for month it couldn't get in the top until the day Webtoon put them in recommended and round up for many months. No offense to the author but I gotta stay with the facts here. Since that it has risen to the top. it got to top the same way all of them are on top, by webtoon placing them there of course.This was also done with featured title such as "let's play" and "fluffy boyfriend"or "cold blooded king", they receive the same wonderful treatment of webtoon., rose above everyone then were featured. For sure we know what is next. bunch of the favorites will be featured soon. I also predicted "olympus Lore" and "the devil is handsome man" would be featured and it was. Not surprising when we seen how much they got promoted by webtoon. They're easy to predict.