Roots of Psy

Son Ga-in, known mononymously as Gain, is a South Korean singer, actress and entertainer, best known as a member of the South Korean girl group Brown Eyed Girls. Having debuted with her home group earlier in 2006, Gain eventually made her solo debut in October 2010 with Step 2/4 to great commercial success, and has since released a total of six extended plays. In addition to her musical career, the singer also appeared in several native programs and series, most notably We Got Married and All My Love for You, where she co-starred alongside 2AM's Jo Kwon.

"See You Again" is a song by American rapper Wiz Khalifa featuring American singer-songwriter Charlie Puth. Produced by Puth, DJ Frank E and Andrew Cedar, who also co-wrote the song with Khalifa, the song was commissioned for the soundtrack of the 2015 film Furious 7 as a tribute to Fast & Furious actor Paul Walker, who died in a single-vehicle crash on November 30, 2013. The song was released on March 10, 2015, before Furious 7 was released, as the soundtrack's lead single. It was later included as a bonus track on the international release of Puth's debut album, Nine Track Mind (2016).