Jeong Dong-hwan

as Nak-won

as Baek Jang -ho

as Bang Ki-ho

as Cha Gi-baek

as Choi Han-gyu

as Hwang Dong-woo

as Oh Yeong-geun

as Jung-su

as Park Jin-suk

as Kim In-su

as President Han

as Teacher Baek

as Chae Byung-Hak

as Noh Joon-suk

as Kim Je-seok

as Lee Young-Joon

as Lee Sun-Moon

as Jang Tae-joon

as Cha Jae-hwan

as Byun Dae-sung

as Han Pan-seok

as Kim Geon-pyo

as Chairman Kim Nam-yoon

as Seo Dae-Seok

as Kim Yongchun

as Kim Seok-joon

as Chae Dae-pil

as Lee Hoe-young

as Oh Tae-suk

as Jang Kil-Taek

as Park Jae-hyun

as Kang Sang-maan

as Chang-sik

as Kang Dong-hyun

as Park Jin-kwon

as Yoon Myung-hoon

as Yoon Soo-ha (2006)

as Ji Kyung-hwan

as Department Head Nam

as Kim Soo-bong

as Kim Jae-man

as Manager Jin

as Professor Kim Jin-woo

as Professor Yoon

as Jong-goo

as Kim Seok Ju

as Jung-yong