The one standout for acting (he was awesome) and made me finish the series, was Kim Won Hae, as Mr. Choi. The music throughout was appropriate for the scenes and it was quieted when the actors/actresses spoke (as it should be).

The story concept isn't new, but it had potential to be a great drama based on first two episodes, but it failed as if the writer got bored and that can make the viewer bored too. They failed with the attempt at a love triangle between the 3 dreamers; ML, FL and Woo Tak (actor Jung Hae In). Maybe it was because there was a lack of chemistry between the ML & FL or because the writing of the romantic moments sucked. During action sequences the camera was super shaky and same on closeups. It's a huge peeve of mine, because all they have to do is use a film/video stabilizer. The worst was in the beginning of Episode 13! So Production for me was a fail. The character development was barely there for the ML and the rest it was non-existant.

Overall other dramas with similar story concept have done better, but the ending of While You Were Sleeping was satisfactory. I wont watch it again and forced myself to finish it. Barely got to 5/10 for me overall, and mostly that was because of Kim Won Hae's acting!