BOL4 originally started as an indie group formed by current member An Ji Yeong and her high school friends. The group of four friends competed on Mnet's audition show "Super Star K 6," (2014), and in 2016, An and fellow member Woo Ji-yoon officially debuted as a duo. BOL4 is known for its signature breezy tunes, which include hits "Galaxy," (2016), "Some," (2017), "Travel," (2018) and "Stars over me," (2019). After Woo left the group in 2020, BOL4 has been a one-person-band of An, dropping "Leo," (2020) featuring Baekhyun of Exo, "Seoul," (2022) and more.