It's actually kinda funny, we know more about Wangnan and Horyang than we do about Leesoo or Hatsu, but the latter two are simply much more interesting characters. Because their interactions with other characters were extremely entertaining, it doesn't really matter that they never got any flashbacks (like Horyang did) or tons of thinking about stuff (like Wangnan).
As for the "build up" explanation: Season 1 had a slow start, but I was hooked just a few chapters in. Evankhell's Hell chapters were not particularly eventful, but the characters they featured made them fun to read. (And the story felt like it had direction, but even if it didn't, the characters still would have been enough to hook me.)
(People don't tend to cite Evankhell's Hell as their favourite arc, but when you think about it, the way those four chapters were put together was pretty much flawless.)
edited 24th Dec '12 10:33:50 PM by fanty
Individual liberation is an illusion.