I needed Kim Woo Bin's face to have been without a mask more often. Sure, Song Seung Heon is a villain but sometimes I almost rooted for him. Jung Seol Ah, Yoon Sa Wol and so on, great cast and good performances. Well-paced so it wasn't boring at least. Very good stunts. Whatever they started, they finished. So glad about that. What they conveyed was definitely clear enough. However, if they could've fleshed it out more and come up with more content and world building, and still managed to wrap it up well, it would've been epic indeed.

Overall 8.5/10, can watch once for entertainment.