Update: Review for this book is now available at
Here's the artbook of a certain mysterious Korean artist known as Rainman.
It's hardcover, 184 pages, priced around US$35. The size is 23cm by 31cm which is just larger than A4.
You can get the book at this Korean online store https://www.anizoon.co.kr/shop/shopdetail.html?branduid=111150&special=3
It's a 500 copy limited edition released in September 2013.