In August 1950, waiting for UN troops to arrive, the South Korean army assembled to protect Nakdong River. Only 71 student-soldiers are left behind to guard the city of Pohang. Now they are on a mission to defend the country from North Korean troops.

Kwon Sang-woo
as Ku Kap-jo

T.O.P
as Oh Jang-beom

Kim Seung-woo
as Kang Seok-dae

Cha Seung-won
as Park Moo-rang

Kim Hye-seong
as Yong-man

Ku Sung-hwan
as Nam-sik

Shin Hyun-tak
as Dal-young

Mun Jae-won
as Yong-bae

Park Jin-hee
as Hwa-ran

Kim Sung-ryung
as Jang-beom's Mother