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'''Apink''' (에이핑크) is a South Korean girl group formed by Play M IST Entertainment (formerly A Cube Entertainment and , Plan A Entertainment and Play M Entertainment). The group debuted on April 19, 2011, with the extended play (EP) ''Seven Springs of Apink'' and with seven members: Park Cho-rong, Yoon Bo-mi, Jung Eun-ji, Son Na-eun, Hong Yoo-kyung, Kim Nam-joo and Oh Ha-young. Hong Yoo-kyung left the group in April 2013 to focus on her studies. Even so Apink's members still keeping good contact with Hong Yoo-kyung all these years.