Title: 써클 : 이어진 두 세계 / Circle
Also known as: Circle: Two Connected Worlds
Genre: Sci-fi, Mystery
Broadcast network: tvN
Episodes: 12
Broadcast period: 2017-May-22 to 2017-June-27
Air time: Mondays & Tuesdays 23:00 KST

Set in the present (2017) and the future (2037), the story is about an alien invasion in 2017 and the subsequent new Earth in 2037; which is separated into the “Smart Earth” where people’s emotions are controlled and no crimes and illness exist, and the “General Earth” where people still suffer from rampant plague and lawlessness.