How did they spend a year after the ‘breakup’. [HAPPENING] is AKMU’s single album being presented in a year and 2 months, since the release of their 3rd album [Sailing]. Before unfolding the story after [Sailing] in detail, ‘AKMU’ would like to address the exhausted emotions after a breakup. Anyone who is able to spot the emotional wounds hidden behind the neat appearance would sense shortly what the narrator is trying to warn. This is a device for the natural development of the upcoming story of ‘AKMU’, and a notice of another big leap.