After A-gong's return from the army in 2011, the band released their eighth album, What is Troubling You in November, on the same day as the album releases of Mandopop heavyweights Jay Chou and Eason Chan.
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The song Enjoy Loneliness shot to fame online after Wu sang it on the talk show Kangxi Lai Le.
The recording of the album took place in London, England, at Strongroom Recording Studio, and the songs, mostly written by Sodagreen's lead singer Wu Tsing-Fong, contain Britpop elements and lyrical references to the supernatural, Faust, Madame Butterfly, Don Quixote and the Greek god Dionysus, the subject of three brief prose passages between tracks, written in English by band manager Will Lin and recited by studio engineer Dan McKinna.