Just my impessions I want to share. -Only eps 1, 2 and may be 3, 4 too are worth watching. The story is good only in that eps. And I would rewatch only them again. -The rest of eps are just one stupid boring soap opera (I scrolled and skipped them almost all). This is the reason for all minuses in my scores. -Eps 1, 2 tell a crazy and unique story in intense way - as if you are watching a good movie. -Kang Haneul is exellent in his role as young DongJoo. And he only appears in eps 1-2 mostly. I don't see any need to change this actor for older ages. Though I'm glad he didn't play in that awkward soap opera I mentioned already. His acting is so emotional and real. -Gu Hye Seon and Nam Ji Hyun playing the same character were quite not bad. And I'm sorry but I think that Lee Sang Yoon's acting is a shame for a drama lead role. -DongJoo's mom and doctor Kang Ji Woon are interesting characters. -Music is quite good