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SM Entertainment is the entertainment company associated with Krystal. SM Entertainment is a South Korean entertainment company founded in 1995. It is one of the largest entertainment companies in South Korea and is known for managing popular K-pop groups such as Super Junior, Girls' Generation, EXO, and Red Velvet. Krystal is a South Korean singer, actress, and model who debuted as a member of the girl group f(x) in 2009.