EUNHA, SINB, and UMJI are a trio of K-pop artists who performed their big hit, "MANIAC," to a wildly enthusiastic audience. The music video shows the band members performing the song live, and it's easy to see why the crowd went wild. The band members are shown in close-up shots, and the camera lingers on their faces as they sing and dance. The audience is clearly having a great time, and they're definitely acting like maniacs all night long.