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A string of brutal murders targeting pregnant women mirrors the crimes of convicted serial killer Shin Hyun, who remains behind bars. Detectives Kim Mi Yun and Kang Tae Hyun take on the case, suspecting that Shin Hyun may be manipulating the copycat killings from prison.

• 
  Yum Jung-ah

  Detective Kim Mi-yun
• 
  Ji Jin-hee

  Detective Kang Tae-hyun
• 
  Cho Seung-woo

  Shin Hyun
• 
  Sung Ji-ru

  Detective Park
• 
  Kim Sun-kyung

  Dr. Chu Kyung-sook
• 
  Lee Eol

  Detective Han Jung-woo
• 
  Park Yong-su

  Chief Jang
• 
  Kwon Hyeok-pung

  Captain Lee
• 
  Kim Roi-ha

  Middle-aged Man
• 
  Park Gil-su

  Bae Yong-man