BOL4 is the shortened rebranding of Bolbbalgan4 (볼빨간사춘기), is the solo project of Ahn Ji Young (안지영; born September 14, 1995), formerly a two-member indie female duo (composed of Ahn Ji Young and Woo Ji Yoon) formed by Shofar Music. They participated on Superstar K 6 in 2014 and signed a contract with their current company, but didn't make their debut until 2016. They officially debuted with the mini album RED ICKLE on April 22, 2016. Read more on Last.fm