Park So-jin (born May 21, 1986), better known by the mononym Sojin, is a South Korean singer and songwriter. She is the leader of South Korean girl group Girl’s Day.
Park So-jin was born on May 21, 1986, in Daegu, South Korea. She attended Lee Hyun Elementary School, Seojin Middle School and Kyungduk Girls’ High School. She majored in Mechanical Engineering at Yeungnam University.
Prior to her debut, Sojin worked as a vocal trainer for the K-pop boy band Ulala Session.
On July 7, 2010, Sojin debuted as a member of Girl’s Day on KBS’ Music Bank with their debut single, “Tilt My Head” (갸우뚱).
On January 9, 2011, Sojin released her first solo single for the Flames of Desire OST, “Our Love Like This”.
On April 19, 2012, Girl’s Day made a comeback with the mini album Everyday II. The album included the song “Telepathy”, which was composed by Sojin. On the same year, Sojin and a male composer wrote the song “It’s Snowing” for Tokyo Girl. The song was later released on December 7.
On March 14, 2013, Girl’s Day released the full-length album Expectation. Sojin wrote the intro song “Girl’s Day World”, and co-wrote the lyrics for “I Don’t Mind” with her fellow members. On October 15, Girl’s Day released the song “Let’s Go”, written and composed by Sojin.
On March 2, 2014, Sojin collaborated with hip hop artist Crucial Star on a remake of Park Hye-kyung’s song “Three Things I Want to Give You”.
On January 30, 2015, Sojin lent her voice for “Dizzy Dizzy” for Part 2 of her SBS’ weekend drama Family Outing OST.
Sojin said that her biggest influence in life is Uhm Jung-hwa. She describes her as a long time leader of her generation who shows abundant expressiveness and depth.