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"Who..." is a Japanese-language song recorded by singer Ayumi Hamasaki. It served as a standard track to her second studio album Loveppears (1999), and was re-recorded and released as a promotional single by Avex Trax in Japan as part of the promotion towards her fifth greatest hits compilation album A Complete: All Singles on September 10, 2008. The track was written by Hamasaki herself, while production was handled by long-time collaborator Max Matsuura. Musically, it is a J-Pop ballad that was written in third-person perspective, like the rest of the content from Loveppears. The lyrics details the encapsulation of Hamasaki, and explaining her message of her own philosophy. During its promotional release in 2008, it reached number 49 on the Billboard Adult Alternative Songs chart in Japan, and number 19 on the RIAJ Monthly Ringtones chart. It was certified Platinum by the Recording Industry Association of Japan (RIAJ) for digital sales of 250,000 units. To promote the single, it appeared on remix and greatest hits compilation albums conducted by Hamasaki.