Jeong-in is a vocalist with an unrivaled voice and excellent emotional expression. Her career started as a guest member of Leesang’s first album, 'Rush', in 2002. Since then, she has received love calls from many artists and has worked on various works including featuring and released a number of hit songs, 'Uphill', 'I hate you' and 'Rainy Season.' Jeong-in left a deep impression by her performance of 'South Korea's performance in Pyongyang, North Korea' in early April 2018. She has been also building works in many areas, including KBS entertainment shows 'The Return of Superman' and 'Jamsiman Village.'