In the 1970s, when everything was surrounded by 'bans', the protagonist that put heat into Korean nights that were silent due to the curfew is the legendary music band 'Devils'. Vocalist Sang-gyu (Cho Seung-woo) who is filled with soul, guitarist Man-sik (Cha Seung-woo) who is overflowing with feelings, and trend leader Mi-mi (Shin Min-a) who is captivating the audience with her splendid fashion and dance - they are standing in the center of the banned night culture enjoying the explosive popularity of go-go clubs full of young people rocking to the music. But their hot night faces an unexpected crisis...