Who's Back? is the 16th studio album by South Korean singer BoA. Her eighth Japanese language album, Who's Back? compiles all of her singles released since Identity in 2010.

After her 2009 English language debut BoA (2009) and her seventh Japanese album Identity (2010), BoA focused on releasing music in South Korea. In 2010, BoA released Hurricane Venus, her first Korean studio album in five years, followed by Only One (2012). In 2011, to celebrate 10 years since her Japanese debut, she released a video single, "Milestone".

Three of the songs on the album were originally released in South Korea as singles: "Only One" and "The Shadow" from Only One (2012), and "Baby You..", a Japanese version of BoA's song "Geuleon Neo (Disturbance)" (2013). All three songs featured writing credits by BoA herself. The majority of the songs on the album were released as Japanese singles, with four of the remaining songs being B-sides for these singles ("The Shadow", "Baby You..", "Close to Me", "Fun"), and a single new song, "First Time".

Many of the songs during their initial released had commercial tie-ups, such as "Woo Weekend" which was used as the 25th anniversary song for Disney on Ice Japan, and both "I See Mee" and "Milestone", which were used in commercials for Audio-Technica headphones. Several songs were theme songs for television programs: the song "Tail of Hope" was used as the opening theme song for the drama Hakui no Namida, while "Message" was used for the online Bee TV drama Love Message!'s theme song. "Masayume Chasing" was used as an opening theme song for the first thirteen episodes of the seventh season of the anime Fairy Tail.

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