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Park Sang-hyun (박상현; born October 7, 1990 in Busan, South Korea), better known by his stage name Thunder (천둥; RR: Cheondung), is a South Korean singer, songwriter, actor and model. He is a former member of South Korean boy band MBLAQ. On December 16, 2014, it was announced that he had departed from the group to focus on studying music. Later, he signed with Mystic Entertainment's music label APOP on February 11, 2015 and released his debut extended play THUNDER on December 7, 2016. After training under Rain and J.Tune Entertainment, Park debuted as a member of MBLAQ in 2009...