That man Oh Soo is a drama with a promising plot but a horrible, horrible execution. I honestly had to force myself to watch the last four episodes cause it was out there unfinished for weeks now and it bothered me. Another reason why I kept watching it was Jonghyun, who was really good in this one. He finally matured into a good actor and I'm glad that he had chances in getting more experiance.
Other than that, the drama was seriously boring. The love story was bleak, the magic fantasy mythology incomplete and never explained properly, the plot was tiring to watch and follow and overall, the pace was too slow and the ending horrible. I mean, if there was at least a nice conclusion I would have rated this one with an additional star, but, unfortunately, the final scenes was just... confusing and unsatisfying. I mean, what happened?? What was that?? I keep thinking about it and I can't figure it out.
So three out of ten because of the performances, some few cute moments and the soundtrack.