Pemeran Nobody Knows

Kim Seo Hyung

as Cha Young Jin

Pemeran Utama

Ryu Deok Hwan

as Lee Sun Woo

Pemeran Utama

Park Hoon (박훈)

as Baek Sang Ho

Pemeran Utama

Ahn Ji Ho

as Go Eun Ho

Pemeran Utama

Min Jin Woong

as Lee Jae Hong [Seoul police department / Detective]

Pemeran Pembantu

Kang Seo Ha

as Yun Ja Yeong [Seoul police department]

Pemeran Pembantu

Jang Young Nam

as Jung So Yun [Eun Ho’s mother]

Pemeran Pembantu

Yoon Chan Young (윤찬영)

as Ju Dong Myeong [Shinsung Middle School]

Pemeran Pembantu

Kwon Hae Hyo

as Jang Gi Ho [New Life Church]

Pemeran Pembantu

Shin Jae Hwi

as Oh Du Suk [Manager of Millennium Hotel]

Pemeran Pembantu

Tae Won Seok

as Ko Hee Dong [Head Security of Millennium Hotel]

Pemeran Pembantu

Park Min Jung

as Bae Sun Ah [Manager of Millennium Hotel]

Pemeran Pembantu

Moon Sung Keun

as Hwang In Bum [Seoul police department]

Pemeran Pembantu

Jo Han Chul

as Yun Hui Seop [Chairman of Shinsung Middle School]

Pemeran Pembantu

Yoon Jae Yong

as Ha Min Sung [Shinsung Middle School]

Pemeran Pembantu

Jeon Seok Chan

as Kim Byung Hee [Seoul police department / Detective]

Pemeran Pembantu

Baek Soo Jang

as Park Jin Su [Seoul police department / Detective]

Pemeran Pembantu

Park Chul Min

as Han Geun Man [Seoul police department / Chief Detective]

Pemeran Pembantu

Lee Chae Eun

as Hong Eun Joo [Seoul police department]

Pemeran Pembantu

Yoo Soon Woong

as Yoo Pan Sool [Church staff]

Pemeran Pembantu

Kang Shin Il

as Seo Sang Won [Pastor]

Pemeran Pembantu

Kim Sae Ron (김새론)

as Cha Young Jin [Young] (Ep.1-3, 13)

Bintang Tamu

Min Sung Wook

as Kevin Jung [CEO] (Ep.6-7)

Bintang Tamu

Jo Sun Mook

as [Secretary General of New Life Church] (Ep.1-2, 5, 7)

Bintang Tamu

Jeon Moo Song

as Kwon Jae Cheon (Ep.12, 15)

Bintang Tamu

Kim Joon Eui

as Go Eun Ho [Young] (Ep.1-2)

Bintang Tamu

Kim Nak Gyun

as [Detective]

Bintang Tamu

Park Jung Eon

as [Pediatric ward mother](Ep.9)

Bintang Tamu

Im Jae Geun

as [Forensic Scientist] (Ep.4)

Bintang Tamu

Kim Dong Kyu

as [Forensic Scientist]

Bintang Tamu

Jang Eui Don

as Choi Man Gi [Detective] (Ep. 4)

Bintang Tamu

Ryu Sung Rok

as Lee Young Shik (Ep.6)

Bintang Tamu

Jung Ji Hoon

as Baek Sang Ho [Child] (Ep.6, 11-12)

Bintang Tamu

Baek Jae Woo

as Baek Sang Ho [Young] (Ep.13, 15)

Bintang Tamu

Seo Kwang Jae

as [Orphanage Director] (Ep.13)

Bintang Tamu

Park Jin Yeong

as Kang In Jik (Ep. 13-14)

Bintang Tamu

Jung Seung Kil

as [Principle of Shinsung Middle School] (Ep.3, 9)

Bintang Tamu

Choi Go

as Joo Han Sol (Ep.5-6, 9, 11)

Bintang Tamu

Sung Hyun Mi

as [Restaurant owner] (Ep. 10)

Bintang Tamu

Seo Joon Hyung

as Jae Min (Ep. 7)

Bintang Tamu

Bae Ho Geun

Bintang Tamu

Sung Min Jun

as Lee Sun Woo (Child) (ep.5)

Bintang Tamu

Shin Hee Chul

as [Policeman]

Bintang Tamu

Choi Ji Yeon

as [Disciplinary hearing member] (Ep.13)

Bintang Tamu

Lee Seung Jin

as [Paramedic]

Bintang Tamu

Kim Woo Jin

as [Hotel employee] (Ep. 10)

Bintang Tamu

Lee Gun Ha

as Yoo Hee Seob [Young]

Bintang Tamu

Lee A Ra

as Lee Seon Kyeong [Young]

Bintang Tamu

Nam Yun Seo

as Bae Seon Ah

Bintang Tamu

Park Shi Yoon

as Oh Doo Seok [Young]

Bintang Tamu

Kwak Jin

as [Chief of school affairs]

Bintang Tamu

Park Se Hoon

Bintang Tamu

Choi Gyo Shik

as [Motorcycle shop worker] (Ep. 15)

Bintang Tamu

Jung Soo Bum

as [Classmate]

Bintang Tamu

Park Se Jun

Composer

Lee Jung Heum

Sutradara

Park Se Joon

Music Editor

Kim Eun Hyang

Screenwriter

Lee So Yi

Bit part

Hwang Hyun Jeong

Bit part

Joo Seung Min

as [Teacher]

Bit part