It's a pretty decent drama. Some might feel that 8 episodes are few too many for this whodunit setting and I agree but the makers of this drama actually pulled it off and delivered an acceptable outcome. I also think that the length of the episodes helped to get a better understanding of the characters involved. Somewhere around halftime the plot does get a little draggy, but nonetheless the suspense was maintained and especially the last two episodes were surprisingly emotional and entertaining.

I also liked the cast; even though they embodied the stereotypical suspects and seemed character- less and plain in the first episodes, learning about their possible motives and their background stories made oneself sympathise with them. I especially liked the actress who played Bit Na's mother and overall I think the cast did a pretty good job given the limited scope they had to show 'real' character and emotions.

I liked how in the end the focus wasn't set on who actually did it, but on why someone would feel urged to take such an action.
Worth giving it a watch.