Circle is a science-fiction drama set in two different time period, the present (2017) and future (2037). The story tells how the appearance of an alien on Earth in 2007 leads to the birth of the Human B system, a technological discovery that can lock people’s memories and convert them to videos. This system is being used in Smart City, a place where no crime exists and people’s emotions are partially controlled. The drama centers on two twin brothers — one is the key to the system and the other one is responsible for its eventual destruction.


General Information

  • Status: COMPLETED
  • Drama Title: Circle
  • Other Titles: Circle: Two Different Worlds
  • Genre: Science-Fiction, Mystery
  • Director: Min Jin-ki
  • Writer: Kim Young-hyun, Park Sang-yeon, Kim Jin-hee, Yoo Hye-mi, Ryu Moon-sang and Park Eun-mi
  • No. of Episodes: 12
  • Broadcast Period: May 22, 2017- Jun 27, 2017
  • Time Slot: 23:00 Korean Standard Time, Mon & Tue
  • Runtime: 60 minutes
  • TV Network: tvN (cable)
  • Production Company(s): Studio Dragon, KPJ
  • Preceded by: The Liar and His Lover
  • Followed by: God of the Water Bride

Main Cast & Characters

main cast of circle

Yeo Jin-goo as Kim Woo-jin. A university student who lives in the year 2017 and struggles hard to survive. He is eager to know the truth behind the mysterious series of deaths involving his twin brother Bum-kyun.

Kim Kang-woo as Kim Joon-hyuk. A hot-tempered and determined detective in 2037, Kim Joon-hyuk enters Smart City to investigate a murder case. He then discovers something bigger that is closely related to him.

Gong Seung-yeon as Han Jung-yeon. She is studying in the same university that Kim Woo-jin attends to. After her best friend commits suicide, her life changes and she gets entangled with Kim Woo-jin as they both search for the truth about the mysterious deaths in their shool.

Lee Ki-kwang as Lee Ho-soo. Lee Ho-soo is a smart city government worker in Smart City. He teams up with Kim Joon-hyuk to solve a murder case.


Official Posters

Original Soundtrack

  • OST Part 1
    • No. 1: Walk With Me by Kwak Jin-eon
    • No. 2: Walk With Me (instrumental)
  • OST Part 2
    • No. 1: Alive by UJi (Bestie) feat. Andup
    • No. 2: Alive (instrumental)

News & Developments


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