This drama is criminally underrated. I don't about others but I liked the story. Travelling through a manhole and in each timeline the characters lives, it was really a good plot for me. I mean I haven't seen any other dramas with similar concept. Yeah time travelling?yes, there's many. But this is something else I've to say. And I've re-watched it 1-2 times as well and I never got bored. Jaejoong and Uee did really good acting . And I also loved that they didn't just break up the supposed to be couple without any reason just to make the actual main couple. They showed why the ex wasn't a good man, his possessiveness and moreover bro was literally a murderer, lol. Overall I liked it. I know everyone's taste is different and some may find it boring or not their cup of tea. But if anyone's thinking whether to go for it or not. I would say yes .