Park Sang-hyun (Korean: 박상현; born October 7, 1990) better known by his stage name Thunder (Korean: 천둥; Cheondung), is the younger brother of 2NE1's vocalist Sandara Park, a South Korean idol and was a member of South Korean idol group MBLAQ until December 16, 2014, when it was announced that Cheondung had departed from the group to focus on studying music for a while. He was re ... Show More