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"O"-Jung.Ban.Hap. (stylized as "O"-正.反.合.), sometimes referred to as "O"-Union or just O, is the third Korean studio album (fourth overall) by South Korean pop group TVXQ, released on September 29, 2006 by S.M. Entertainment. In a year when Korean music sales had slumped, it was the highest selling album in South Korea in 2006 and won the group several prominent awards in South Korea.<ref>11월 가요음반 판매량집계 Archived at WebCite</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=news }}</ref> The album stayed charted within the top 50 throughout 2007, and by 2012, the album sold over 450,000 copies in South Korea.<ref name="sales">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

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 mononymous lead single has lyrics that regard global conflicts with a plea for peace and resistance. The album has a balance of fast tempo songs and ballads.

"O"-Jung.Ban.Hap. sections
Intro  Versions and repackaging   Singles   Performances   Track listing   Release history  Charts and sales   References   

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