I found this to be a compelling drama. The acting varies from okay to good, and above. Nobody gives an embarrassing performance, although there are sequences which the writers should have been embarrassed by. It also features more kidnapping sequences than I have seen in any other drama or movies. One character gets kidnapped at least three times. But It had some powerful moments too. The characters are well done, and the story even allows some minor ones to have a little bit of spotlight. One character, who I found to be the most interesting of the young people in the drama leaves about 3/3rd's of the way through.( Note. According to Wikipedia, she left because her storyline was reduced). But then they bring in another character, who is quickly forgotten about.
There are 2 standout performances in this drama for me.
Lee Mi Sook. and Yoo Dong Geun.