You know what? Cheesyhoboe is right, this is a by-the-numbers action shonen involving demons. DO NOT go into Aflame Inferno believing you'll find something that'll blow all other shonen mangas/manhwas away, even all other shonen mangas/manhwas with ecchi. You won't find it.
Having said all that, there's still something about Aflame Inferno that keeps me coming back chapter after chapter. The artwork is good, particularly if you like ecchi, and even if you don't, you'll probably still like it. I don't usually like it, but rather than using the ecchi to humiliate the female characters in some way, (apart from the first chapter) this is more of a case where the main female is drawn in an idealized, provocative way, which I have no problem with.
As for the characters, I don't like the main character--4 volumes in and I can hardly tell you anything about the guy: what he wants out of life, his like/dislikes, nothing. He's more of a collection of accomplishments rather than an actual personality. But even if Kang Shichan is lame, nearly every single character is better, especially the 4 kings of hell. Each one is very different than you expect him/her to be--not quite evil, not quite good, and they all have interesting relationships with one another. So far, it seems like they will be the focus of the series, which is very, very good, except that it makes Kang Shichan sort of extraneous--he's there because he's Inferno's host and is in control of their body, but why not have just made Inferno the lead and forget about him all together?
The romance is pretty good too. Kang Shichan has 3 potential women he could end up with: Of course Chaehee or Gehenna, but also surprisingly
Inferno, who was very pretty when she was human.
Undoubtedly it'll be either Chaehee or Gehenna, but that last one could be very, very interesting if it comes to pass. All in all, I'd say give this one a shot as it's fun and you'll probably like it.