Circle

In the year 2007, before the main events of the drama, 11-year-old fraternal twin brothers Kim Woo-jin (Jung Ji-hoon) and Kim Bum-gyun (Kim Ye-joon), along with their neuroscientist father Dr. Kim Kyu-chul (Kim Joong-ki), witness the arrival of a female humanoid alien (Gong Seung-yeon). Out of pity and curiosity, the family brings the alien with them and adopts her like a real member of the family. The twins become fond with her, especially the younger twin Woo-jin who names her Byul. By chance, Dr. Kim discovers Byul's secret: she had brought with her an advanced form of technology that can record, and even lock, memories and convert them into video. In order to closely study this alien technology, Dr. Kim isolates himself from his family to work secretly on Byul in what he calls the "Beta Project." Dr. Kim never went back home since then, making the elder twin Bum-gyun think Byul has taken their father captive, though Woo-jin believes their father has abandoned them. [cont.][About:]Circle is a 2017 South Korean science fiction television series starring Yeo Jin-goo, Kim Kang-woo, Gong Seung-yeon, and Lee Gi-kwang. The series features two parallel plots set in the years 2017 and 2037, both centered on a twin brothers' struggle with the discovery and development of an advanced alien technology that could either be a boon or bane for the entire humanity.It aired on tvN for 12 episodes at 23:00 KST on Mondays and Tuesdays from May 22 to June 27, 2017.[Source: Wikipedia]