Pemeran Master of Study

Kim Soo Ro

as Kang Seok Ho

Pemeran Utama

Bae Doo Na

as Han Su Jeong

Pemeran Utama

Yoo Seung Ho (유승호)

as Hwang Baek Hyeon

Pemeran Utama

Go Ah Sung (고아성)

as Kil Pul Ip

Pemeran Utama

Lee Hyun Woo (이현우)

as Hong Chan Du

Pemeran Utama

Park Ji Yeon

as Na Hyeon Jeong

Pemeran Utama

Lee Chan Ho

as O Bong Gu

Pemeran Utama

Park Chul Ho

as Hong Chung Sik [Chan Du's fathe]

Pemeran Pembantu

Bang Eun Hee

as Han Ae Sim

Pemeran Pembantu

Shim Hyung Tak

as Jang Yeong Sik [Science teacher]

Pemeran Pembantu

Im Ji Eun

as Lee Eun Yu [Korean teacher]

Pemeran Pembantu

Ko Ju Yeon

as Lee Ye Ji

Pemeran Pembantu

Koo Hey Ryoung

as Hwang Geum Ju

Pemeran Pembantu

Park Hwi Soon

as Sa Do Cheol [Teacher]

Pemeran Pembantu

Im Sung Min

as Bae Yeong Suk [Teacher]

Pemeran Pembantu

Kwon Hyun Sang

as Kwak Jong Min

Pemeran Pembantu

Lee Byung Joon

as Anthony Yang [English teacher]

Pemeran Pembantu

Kim Young Ok

as Lee Bun I [Baek Hyeon's grandmother]

Pemeran Pembantu

Byun Hee Bong

as Cha Gi Bong [Maths teacher]

Pemeran Pembantu

Kim Mi Ra

as Kim Jeong Hui

Pemeran Pembantu

Jung Tae Won

as Jin Dol I

Pemeran Pembantu

Hong Il Kwon

as [Seok Ho's friend]

Pemeran Pembantu

Oh Yoon A

as [School's principal]

Pemeran Pembantu

Kwak Seung Nam

Pemeran Pembantu

Jeon Ji Hoo

Pemeran Pembantu

Ji Il Joo

as [Bong Gu's elementary classmate] (Ep. 2)

Bintang Tamu

Ham Eun Jung

as [Gangster girl] (Ep. 7-8, 10)

Bintang Tamu

Kim Ha Kyun

as O Dal Sik [Owner of Pulip's house]

Bintang Tamu

Hyo Min

as [Gangster girl]

Bintang Tamu

Jeon Bo Ram

as [Gangster girl]

Bintang Tamu

Lee Kyu Ri

as [Gangster girl]

Bintang Tamu

Kim Bit Na Ri

Bintang Tamu

Kim Tae Young

Bintang Tamu

Lee Sae Rom

Bintang Tamu

Park Won Ho

Bintang Tamu

Choi In Hee

Composer

Yoo Hyun Ki

Sutradara

Kang Sung Tae

Original Creator

No Sang Hun

Producer

Yoon Kyung Ah

Screenwriter