I must say, Circle is the closest to a near-perfect minidrama that I've ever seen. In just 12 episodes it succinctly and cleverly delivers a solid and captivating story without being overly ambitious nor disappointingly sparse. Was is my favorite drama of 2017? Probably not. So why do I pretentiously name it as a near-perfect minidrama? Because despite it not being my personal favorite (I still thoroughly enjoyed it), it is the pinnacle of what a minidrama should be. Usually, due to limited runtime, 12-episode dramas either are too ambitious and fail to properly articulate the story/message, or they just forego substance altogether. Circle's writing, editing, and formatting is able to present a story, message, and impact that balances pace and relevance. It's easy to mix up sci-fi and fantasy. In my dictionary, fantasy tends to focus more on lore, while sci-fi is more focused on the consequences of human's actions. I'm not going to spoil anything, but I will confirm that this is sci-fi. There's action, tech, and definitely some curveballs, but if you're looking for something more fantasy, this drama may not be what you want. If you're looking for some action and thought-provoking narrative, I'd highly recommend this. Now for the best part: the cast and acting. With such a short and fast-paced drama, a huge burden shifts from the story to the actors; they basically have to carry the story along. I've watched some of Yeo Jin Goo's child acting, which was enjoyable, but him as a lead was very impressive. Aside from the fact that he's just so darn pretty, he's able to express emotion far beyond his young age. The biggest surprises here were Kim Kang Woo and Lee Ki Kwang. I must say that Kang Woo stole the entire show (sorry Jin Goo). I've never seen him before, but I plan to keep watching his works; I haven't seen an actor display such raw emotion in a long time. He even moved me to tears in my favorite scene of this drama. As for Ki Kwang, I didn't know what to expect from an idol actor, but he blew me away. I felt every emotion he expressed, when he smiled, I found myself smiling. When he was distressed, I felt his frustration. Absolutely amazing. As for Gong Seung Yeon, I recently became a HUGE fan after Introverted Boss and My Only Love Song. This girl will make it big. She's absolutely charming. As for music, there's only 2 songs on the OST, but they're solid. Not the best, but definitely enough for this drama. As for rewatch value, I think this is the only drama I would give a 10. It's so complex that I'm tempted to go back and find clues. Overall, a very good drama. Some may find unsatisfying plot holes, but I had no problem with the omitted information. It's heavy on action and humanity, and light on world-building and lore.