I like to think of it as the equivalent to reading "Dashed by the Duke", or "Eloping with the Earl", or "Creeping with the Count", or "Vagabonds with the Viscount", if you're into historical romance novels. They're popular because they're wish fulfillment, and since you're wishing for something, might as well dream of something that's very unlikely to happen in real life! I suppose a modern-day English novel would be more along the lines of "The Big Bad Billionaire", or "The CEO Next Door", as so on. We just happen to enjoy reading about regular people who meet extraordinary people, and one of the easiest forms of making a character extraordinary is wealth, fame, and family. Don't get me wrong, I would never put myself through the trouble of dating some rich chaebol in real life, but it's definitely more thrilling to read about that than about my actual plush, pillowy boyfriend whose favourite thing is coming home from work and playing Minecraft. As far as comparing it with Indonesian stories, though, that part I really am not sure. We're getting a super limited sample size here of CN webnovels, since a lot of the ones available online gear toward these tastes specifically. Plenty of these stories get translated into Indonesian, though, so shouldn't there be at least some market for them?