At release, Circle’s premiere scored a modest 2.3% ratings in Korea, but international reviews on forums like MyDramaList and Reddit praised its ambition. Many compared it to Dark (Netflix) for its time-bending mystery, though Circle is more compact (only 12 episodes).

– The story begins with young twin brothers, Kim Woo-jin and Kim Beom-gyun, encountering a mysterious woman who appears to be an alien. Ten years later, Woo-jin is a college student investigating a string of mysterious suicides at his university. He suspects his brother, Beom-gyun—who is obsessed with finding that "alien"—is involved, only to encounter Han Jung-yeon, a student who looks exactly like the woman from their childhood. Part 2: A Brave New World (2037)

– South Korea is divided into the crime-ridden "General Earth" and the high-tech, emotion-controlled "Smart Earth". Detective Kim Joon-hyuk from General Earth manages to enter Smart Earth to investigate a rare murder, secretly hoping to find his long-lost brother. Key Cast & Characters