BOL4, also known as Bolbbalgan4 is a South Korean soloist under Shofar Music. Bolbbalgan4 started as a duo, consisting of Jiyoung and Jiyoon. They both participated on Superstar K6 in 2014. Bolbbalgan4 officially debuted on April 22, 2016. On April 2, 2020 Jiyoon left the group, and Jiyoung continued promoting under the name BOL4 as a soloist.