I really like this manhwa: the pacing of the story is agonizing (in a good way) and the story itself is quite emotionally engaging; the art work is surprisingly expressive for its minimal style of line-drawing, with the facial expressions--in all their variety and depth--being a powerful vehicle for the story. Brava (bravo?) to you, Park Nodeok!
(Also I really like Rei's running commentary in the margins. I find they add to the story.)