I didn't know that there will be another drama than Tunnel I find this Amazing. But here it is. 'Cirlce' is amazing. Honestly I am not a fan of the sci-fi genre and I don't like it, when there is too much science, but I like this drama so much even though I was confused sometimes. Story: The story sounds interesting with two different years at the same time. Why I didn't gave the story a 10 but a 9 is the aspect with the sci-fi genre which is an important aspect in this drama. But the fact that there isn't comedy makes up for it. People who are looking for a romance in the first place are at the wrong place with Circle, because there isn't much. You can guess who like who when you watch the whole drama, but the romance genre isn't included and in my opinion it is the best for the drama. Cast: At first I watched the drama because Yeo Jin Goo and Kim Kang Woo. I love both of them as Actors very much. Yeo Jin Goo is a very promising Actor and it breaks my heart when I think about the year he will be gone for two years. YJG played the Role of Kim Woo Jin who lives in the year 2017 and is a student at the university. He has to work part time because of his Grandmother who is in a nursing Home and that costs money. So he takes every opportunity to get Money and he wants to research at the university where he isn't very popular because of some things his peers can't understand or doesn't want to understand. Jin Goo plays his role authentical and very realistic. When he cried, my heart broke, but when he laughed I smiled. Woojin is a nice young Man,who loves his grandmother and his twin Brother and who was played by a perfect young Actor who has a promising future ahead of him. Ahn Wooyeon played his older twin brother who was a bright child but an incident in their childhood changed him completely. Kim Bum Gyun is a young Man who thinks the world was taken over by an Alien, but he loves his younger brother more than his own life. AWY played this role really good. I know him since Five children but in my opinion he played this role better. His Chemistry with Jung Insun (Park Minyoung) was very nice to see, but the Bromance between the Twin Brother were the best. Hearbreaking and sad, but also funny at some times. Kim Kang Woo played the other Male Main Role. Finally a great role. I loved him in Goodbye Mr. Black, watched a few Movies and I love him very much. Like Yeon Woojin I think Kim Kang Woo is one of the most underrated Actors out there. I mean he is 38 (in two days 39) but he doesn't seem to age. Back to his acting. In my opinion his role (Kim Joonhyuk) was the most pitiful in the whole drama. Kim Joonhyuk lives in the year 2037 and works as a police officer who gets into the peaceful new world (Smart Earth) to uncover an incident and because he want to finde someone. Joonhyuk cried a lot in this drama. When he cried I cried too His chemistry with Kikwang and his relationship with Chief Hong were so good, I don't know how Kim Kang Woo could be acting so good. Like I said he is too underrated. Gong Seung Yeon played the Female Lead Role Han Jungyeon who lives in both parts. She is a student who studies alongsinde Woojin and is the daughter of professor Han. Jungyeon is a mysterious young Woman who seems to be a normal student. The whole time i was curious because she acted normal but I thought she must have a secret. Seung Yeon plays her role excellent. She played a young woman here and an genious who love science and who seems to like Woojin for some reason. Last but not Least: Lee Kikwang (Member of Boygroup Highlight/formerly Beast) played Lee Hosoo, a government employee of Smart Earth who doesn't have any Memories of his past. I didn't watched many shows with Kikwang (or I don't know if he was there^^) but his acting was good. I didn't liked his role at first but later I came to like him a bit. Kikwangs acting was decent for an Idol. Music: I love the Song Alive by Uji (Bestie) the most. It is played when it fits and her voice is very good. Totally underrated. Rewatch: This drama has 12 Episodes so I will watch it again in the future. The Episodes fits very good. It wasn't draggy and it wasn't boring. I would recomend to watch the first episodes, because you have to like the concept of two parts per episode. If oyu don't like it the drama might not fit you but I would recommend it when you like sci-fi and mystery (aliens and so on).