North Korea, facing international sanctions, seeks assistance from a Hungarian NGO to build churches in Pyongyang as a way to bypass the sanctions. The NGO proposes organizing a revival meeting with international Choir organizations, leading the Ministry of 5 Securities to apprehend believers. The "Victory Orchestra," a replacement ensemble, is actually composed of underground Choir members. As they sing hymns openly for the first time, their true identity as underground believers is revealed, creating moments of laughter, tears, and emotion.

Park Si-hoo
as Kyo-sun

Jeong Jin-woon
as Captain Kim

Tae Hang-ho
as Choir leader

Jang Ji-gun
as Wang Gil-jo

Han Jung-wan
as Ri Man-su

Ko Hye-jin
as Ri Su-rim

Moon Kyung-min
as Oh Cheol-ho

Choi Sun-ja
as Yang Sun-ja

Nam Tae-hoon
as Kim Chang-su

Shin Han-kyeol
as Ri Jeong-hee