Pemeran Brain Works

Jung Yong Hwa

as Sin Ha Ru

Pemeran Utama

Cha Tae Hyun (차태현)

as Geum Myeong Se

Pemeran Utama

Kwak Sun Young (곽선영)

as Seol So Jeong

Pemeran Utama

Ye Ji Won

as Kim Mo Ran

Pemeran Utama

Jung Dong Hwan

as Hwang Dong U

Pemeran Pembantu

Woo Hyun

as Kim Gil Jung

Pemeran Pembantu

Kim Soo Jin

as Sin Ji Hyeong

Pemeran Pembantu

Im Chul Hyung

as Park Chi Guk

Pemeran Pembantu

Jun Sung Hwan

as O Jun Seo [Sin Ha Ru's assistant]

Pemeran Pembantu

Lee Chang Wook

as Professor Jin

Pemeran Pembantu

Kim Ah Song

as Geum I Na

Pemeran Pembantu

Kim Jin Seo

as Moon Yong Jun [Reporter]

Pemeran Pembantu

Han Soo Yeon

as Jung In Yeong

Bintang Tamu

Jang Ho Il

as Kim Jae Won

Bintang Tamu

Moon Won Ju

as O Sang Gi

Bintang Tamu

Song Min Ji

as Kim Hui Ju

Bintang Tamu

Kim Kang Il

as Kang Sung Ha

Bintang Tamu

Park Ga Young

as [Reporter] (Ep. 1-2)

Bintang Tamu

Kim Nak Gyun

as [Prison guard] (Ep. 2-3)

Bintang Tamu

Park Seon Woo

as [Publisher] (Ep. 3)

Bintang Tamu

Chris Chan

as [Factory worker] (Ep. 3)

Bintang Tamu

Kim Joon Hyung

as [Detective] (Ep. 3)

Bintang Tamu

Kim Tae Moon

as [Doctor] (Ep. 3)

Bintang Tamu

Lee Dong Soo

as [Mortuary staff] (Ep. 3)

Bintang Tamu

Yoo Byung Hoon

as Lee Jong Gu (Ep. 3-4)

Bintang Tamu

Hong Ah Reum

as Thoung Nguyen (Ep. 3-4)

Bintang Tamu

Jiyun Kim Huong

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

Bintang Tamu

Sim Hyun Seo

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

Bintang Tamu

Ji Sung Geun

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

Bintang Tamu

Geum Ho Suk

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

Bintang Tamu

Seo Woo Jin

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

Bintang Tamu

Yoo Joon A

as [Doctor] (Ep. 5)

Bintang Tamu

Ji Han Ah

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

Bintang Tamu

Lee Sang Sook

as Lee Jeong Ja (Ep. 5-6)

Bintang Tamu

Chae Min Hee

as Yang Eun Jeong (Ep. 5-6)

Bintang Tamu

Shim Ji Yoo

as Han Ji Yeol (Ep. 5-6)

Bintang Tamu

Yoon Hyo Sik

as Han Seong U (Ep. 5-6)

Bintang Tamu

Kim Jin Ok

as [Believer] (Ep. 5-6)

Bintang Tamu

Yoo Yong

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

Bintang Tamu

Choi Da Eum

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

Bintang Tamu

Lee Seung Jun

as Heo Beom Su (Ep. 7-8)

Bintang Tamu

Jun Ik Ryoung

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

Bintang Tamu

Im Do Hwa

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

Bintang Tamu

Han Ji Wan

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

Bintang Tamu

Park Soo Oh

as Kim Ho Yeong (Ep. 9-10)

Bintang Tamu

Oh Ki Hwan

as [Detective] (Ep. 9)

Bintang Tamu

Lee Won Jung (이원정)

as Kim Jun Yeong (Ep. 9-10)

Bintang Tamu

Park Jun Hyuk

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

Bintang Tamu

Oh Yoon Hong

as Choi Jeong Yun (Ep. 9-10)

Bintang Tamu

Oh Ga Bin

as [Witness] (Ep. 9-10)

Bintang Tamu

Kim Seung Han

as Kim Ho Yeong [Child] (Ep. 10)

Bintang Tamu

Park Joon Sang

as [KCSI investigator] (Ep. 11)

Bintang Tamu

Lee Ye Ji

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

Bintang Tamu

Lee Won Joo

as Im Yeong Hun (Ep. 11)

Bintang Tamu

Lee Seung Hyung

as [Lawyer] (Ep. 11-12)

Bintang Tamu

Park Jong Bo

as [Detective] (Ep. 12, 15)

Bintang Tamu

Yoo Sung Min

as Kim Hyeon Jun (Ep. 12-14)

Bintang Tamu

Ha Shi Eun

as Na Ji Ye (Ep. 13)

Bintang Tamu

Bae Jae Hyun

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

Bintang Tamu

Kwak Na Yeon

as [Exercising woman] (Ep. 14)

Bintang Tamu

Jung Min Jung

Bintang Tamu

Park Se Jun

Composer

Lee Jin Seo

Sutradara

Park Gi Ho

Executive Producer

Park Kyung Soon

Screenwriter