Brain Works

Composer

• 
  Park Se Jun

Director

• 
  Lee Jin Seo

Executive Producer

• 
  Park Gi Ho

Screenwriter

• 
  Park Kyung Soon

Main Role

• 
  Jung Yong Hwa

  Sin Ha Ru

  Main Role
• 
  Cha Tae Hyun

  Geum Myeong Se

  Main Role
• 
  Kwak Sun Young

  Seol So Jeong

  Main Role
• 
  Ye Ji Won

  Kim Mo Ran

  Main Role

Support Role

• 
  Jung Dong Hwan

  Hwang Dong U

  Support Role
• 
  Woo Hyun

  Kim Gil Jung

  Support Role
• 
  Kim Soo Jin

  Sin Ji Hyeong

  Support Role
• 
  Im Chul Hyung

  Park Chi Guk

  Support Role
• 
  Jun Sung Hwan

  O Jun Seo [Sin Ha Ru's assistant]

  Support Role
• 
  Lee Chang Wook

  Professor Jin

  Support Role
• 
  Kim Ah Song

  Geum I Na

  Support Role
• 
  Kim Jin Seo

  Moon Yong Jun [Reporter]

  Support Role

Guest Role

• 
  Han Soo Yeon

  Jung In Yeong

  Guest Role
• 
  Jang Ho Il

  Kim Jae Won

  Guest Role
• 
  Moon Won Ju

  O Sang Gi

  Guest Role
• 
  Song Min Ji

  Kim Hui Ju

  Guest Role
• 
  Kim Kang Il

  Kang Sung Ha

  Guest Role
• 
  Park Ga Young

  [Reporter] (Ep. 1-2)

  Guest Role
• 
  Kim Nak Gyun

  [Prison guard] (Ep. 2-3)

  Guest Role
• 
  Park Seon Woo

  [Publisher] (Ep. 3)

  Guest Role
• 
  Chris Chan

  [Factory worker] (Ep. 3)

  Guest Role
• 
  Kim Joon Hyung

  [Detective] (Ep. 3)

  Guest Role
• 
  Kim Tae Moon

  [Doctor] (Ep. 3)

  Guest Role
• 
  Lee Dong Soo

  [Mortuary staff] (Ep. 3)

  Guest Role
• 
  Yoo Byung Hoon

  Lee Jong Gu (Ep. 3-4)

  Guest Role
• 
  Hong Ah Reum

  Thoung Nguyen (Ep. 3-4)

  Guest Role
• 
  Jiyun Kim Huong

  [Thoung Nguyen's sister] (Ep. 3-4)

  Guest Role
• 
  Sim Hyun Seo

  Jung Eun Ho [I Na's friend] (Ep. 3, 12-14)

  Guest Role
• 
  Ji Sung Geun

  [Thoung Nguyen's brother-in-law] (Ep. 4)

  Guest Role
• 
  Geum Ho Suk

  Kang In Ho [Prison guard] (Ep. 4-5, 11-13)

  Guest Role
• 
  Seo Woo Jin

  Sin Ha Ru [Child] (Ep. 4-5, 15)

  Guest Role
• 
  Yoo Joon A

  [Doctor] (Ep. 5)

  Guest Role
• 
  Ji Han Ah

  [Ji Yeol's aunt] (Ep. 5)

  Guest Role
• 
  Lee Sang Sook

  Lee Jeong Ja (Ep. 5-6)

  Guest Role
• 
  Chae Min Hee

  Yang Eun Jeong (Ep. 5-6)

  Guest Role
• 
  Shim Ji Yoo

  Han Ji Yeol (Ep. 5-6)

  Guest Role
• 
  Yoon Hyo Sik

  Han Seong U (Ep. 5-6)

  Guest Role
• 
  Kim Jin Ok

  [Believer] (Ep. 5-6)

  Guest Role
• 
  Yoo Yong

  [Lee Jeong Ja's assistant] (Ep. 5-6)

  Guest Role
• 
  Choi Da Eum

  Han Seong Mi [Sting operation student] (Ep. 7)

  Guest Role
• 
  Lee Seung Joon

  Heo Beom Su (Ep. 7-8)

  Guest Role
• 
  Jeon Ik Ryung

  Kim Jae Suk [Heo Beom Su's wife] (Ep. 7-8)

  Guest Role
• 
  Im Do Hwa

  Cherry [Virtual human] (Ep. 7-8)

  Guest Role
• 
  Han Ji Wan

  Han Yeon Hui [Prosecutor] (Ep. 8-9, 11-12)

  Guest Role
• 
  Park Soo Oh

  Kim Ho Yeong (Ep. 9-10)

  Guest Role
• 
  Oh Ki Hwan

  [Detective] (Ep. 9)

  Guest Role
• 
  Lee Won Jung

  Kim Jun Yeong (Ep. 9-10)

  Guest Role
• 
  Park Jun Hyuk

  Kim Jun Yeong [Teen] (Ep. 9-10)

  Guest Role
• 
  Oh Yoon Hong

  Choi Jeong Yun (Ep. 9-10)

  Guest Role
• 
  Oh Ga Bin

  [Witness] (Ep. 9-10)

  Guest Role
• 
  Kim Seung Han

  Kim Ho Yeong [Child] (Ep. 10)

  Guest Role
• 
  Park Joon Sang

  [KCSI investigator] (Ep. 11)

  Guest Role
• 
  Lee Ye Ji

  [Cho Na Yeong's neighbor] (Ep. 11)

  Guest Role
• 
  Lee Won Joo

  Im Yeong Hun (Ep. 11)

  Guest Role
• 
  Lee Seung Hyung

  [Lawyer] (Ep. 11-12)

  Guest Role
• 
  Park Jong Bo

  [Detective] (Ep. 12, 15)

  Guest Role
• 
  Yoo Sung Min

  Kim Hyeon Jun (Ep. 12-14)

  Guest Role
• 
  Ha Shi Eun

  Na Ji Ye (Ep. 13)

  Guest Role
• 
  Bae Jae Hyun

  [Hyeon Jun's friend] (Ep. 13-14)

  Guest Role
• 
  Kwak Na Yeon

  [Exercising woman] (Ep. 14)

  Guest Role
• 
  Jung Min Jung Guest Role