Park Sojin (박소진) is a South Korean singer and actress under Noon Company. She is best known for being the leader of the group Girl's Day. Before debuting, Sojin used to be a vocal trainer for the band Ulala Session.
Sojin debuted as the leader of Girl's Day on July 9, 2010 with the mini album "Girl's Day Party #1".
On January 11, 2019 DreamT Entertainment announced that Sojin would be leaving the agency after deciding not to renew her contract which expires in February.
On March 19, Sojin signed with Noon Company to launch her career as an actress but emphasized that she is taking a break from group activities and is still part of Girl's Day.