The idea for "Oppa, Oppa" was inspired by Yoo Jae Suk and Lee Jeok's performance of "Apgujeong Nallari" on Infinite Challenge: after seeing it on TV, Donghae decided to go for a "disco funky concept".[1]
Originally, the melody of the chorus was different, smoother and less catchy, but it was modified thanks to an idea by their choreographer Shim Jae-won.[1]
The music video is composed of footage from concerts, live stages and their waiting rooms and was made by Shindong.[1]
