Most problems with TV dramas is that they are too slow. "Whirlwind" is the opposite. It moves way too fast, turning and twisting from one impossible complication to another. Characters are also switching allegiance back and forth between various allies/enemies. All these points make for a very fast-paced storyline that keeps me guessing, but the problem is that the fast pace also makes it difficult for me to develop any attachment to the characters.
I love stories that feature characters who are neither entirely good or entirely bad, and "Whirlwind" has several of them, and the mature and understated acting made their portrayal of the characters very exciting to watch. Unfortunately, everything these characters do seem to be driven by the chaotic plot line. Despite these characters having very noble aspirations and idealistic goals, I just could not sympathize with them.
Most of the acting was quite good, except for the two young political aids. Lim Se Mi is particularly dull as her character seems quite one-dimensional. If her love interest was better-looking, that would have helped a lot.