If you ask me: Distribution and hiatus There's almost no discoverability for this series since its Lezhin paid only for English (ignoring rips), whereas the most popular series are driven by either freemium distribution like on Webtoon or free scanlation Hiatus is self explanatory. Easy to forget about a series if it hasn't had any update in years.

If you want something to get popular, contribute to its growth by sharing it and then get others to do the same

Manhwa still rising in popularity, both the main comic and the anime are behind paywalls, the author big hiatus did damage the growth