The album's name "O"-Jung.Ban.Hap, literally translated to "O"-Justice.Opposition.Solution, is based on Georg Wilhelm Friedrich Hegel's theory of thesis, antithesis, synthesis.

The album's lead single of the same name has lyrics that regard global conflicts with a plea for peace and resistance.

The initial versions of the album with the original track listing was released in CD and cassette formats.

U-Know Yunho's footage was shot in Japan, Micky Yoochun's and Max Changmin's in Prague, Hero Jaejoong's in Thailand, and Xiah Junsu's in South Korea.

In drastic contrast to the lead single, "Balloons" (Pungseon in Korean) is a bubbly song that features TVXQ members in animal costumes, made to directly appeal to the younger generation, as well as older generations familiar with the original "Balloons" by Five Fingers (an old Korean band).