My first time watching a 4 episode Drama but I enjoyed it! It was calculating and was able to focus on something other than the coronavirus. Seo Joon Young was excellent at playing twins. The director/producer did great in having the twins together and it seemed real. Awesome Job for a 2013 drama. I said 4 episodes because one of the #3 episode, I couldn't view it because you weren't able to view it, missing, but it didn't matter the storyline was perfect. I wished they could remake this in 2020. That would be great.