The entire series moves very quickly. It's full of boisterous characters, but there are a few calm ones every now and then. The story mainly surrounds supernatural beings that aren't clearly explained, and sometimes the background stories can be vague. The art is even a bit disproportionate in my opinion, but I find most Korean manhwas are drawn in this style. However, those "faults" don't take away from the greatness of the series. It mends a heart as rapidly as it breaks one.