This is essentially a character design book by Hyung-Tae Kim.
It contains characters from Magnacarta, Magnacarta the phantom of avalanche, The War of Genesis III Part.2, The War of Genesis III. At the back of the book are a few pages of line sketches.
The character designs are marvelous.
Included as a bonus is a how-to-paint process, although there are no captions.
I've no idea where to get the book online. If you're doing a search, the ISBN is 4-7577-2095-5.
Thanks to Kelvin Chan for providing the book for a short review.