“Kim Song Sun” (김송선), or simply known as Songsun (송선) is a South Korean singer currently under TR Entertainment. She is the leader, lead dancer and main vocalist of the girl group TRI.BE.
Pre-debut: Banana Culture Newkid
On September 23, 2018, Songsun was introduced as a trainee and member of Banana Culture’s pre-debut group Banana Culture Newkid. However, the pre-debut group is assumed to have disbanded after 3 of its 4 members left the agency.
2020–2021: Debut with TRI.BE
SongSun joined Lionheart Entertainment as a trainee sometime in 2020. On November 16, 2020, she was introduced as the seventh and final member of TRI.BE. The group officially debuted on February 17, 2021 with their first single album “TRI.BE Da Loca”.
Source: tri.be fandom