Choi Min-sik as Ri Hak-sung

Kim Dong-hwi as Han Ji-woo

Park Hae-joon as Ahn Gi-chul

Park Byung-eun as Kim Geun-ho

Jo Yoon-seo as Park Bo-ram

Tang Joon-sang as Tae-yeon

Kim Won-hae as Park Pil-joo

Ju Jin-mo as Professor Oh

Kim Hee-jung as Bo-ram's Mother

Kang Mal-geum as Ji-woo's Mother

Joo Ye-rin as Korean Teacher

Jung Seung-kil as NIS Agent

Shin Jae-hwi as Student 5

Kang Joon-kyu as Ui-joon

Kim So-suk as Principal

Choi Jae-sup as Hanbok Teacher

Ro Jong-hyun as Ddal-bong