MoonLight wrote: I don't understand this stupid obsession of becoming a human, they're much better as gumiho so stay that way.
Well, I would assume it is because Wol Ryung truly loved Yoon Seo Hwa and didn't want to watch her die while he lived for god knows how long, don't recall how long he had been living for, but I'm pretty sure it was long enough to make the right decision.
Kang Chi on the other hand has always lived as a human, so being a gumiho is just something he hates for obvious reasons, despite the awesome super powers, I'm pretty sure anyone would freak the f*** out if they suddenly turned into a beast, even more so when he can't fully control himself and scares off his loved ones.
Of course I could be over-analysing the facts and the actual truth is probably something like:
"I'm the writer, I do what I want! I want them to want to turn human!"