BOL4
BOL4 (Korean: 볼빨간 사춘기; RR: Bolppalgan Sachungi), also known as Bolbbalgan4 or Blushing Youth (赤頬思春期, Akahō Shishunki), is a South Korean musical act formed by Shofar Music in 2016. They appeared on Superstar K6 in 2014 before signing a contract with their current agency. BOL4 was originally a duo consisting of Ahn Ji-young and Woo Ji-yoon. They debuted with the single "Fight Day" from the mini-album Red Ickle on April 22, 2016. The group's name in English comes from the first syllable of the Korean word sachungi ("puberty"), which is pronounced the same as the Sino-Korean numeral four (sa).
The duo went on a temporary hiatus due to Ahn's music classes requirements in the first half of 2018. BOL4 signed with King Records and debuted in Japan on June 5, 2019, with the mini-album Red Planet (Japan Edition).
On April 2, 2020, Shofar Music announced that Woo Ji-yoon had left the duo and that Ahn Ji-young will continue to promote as BOL4 as a solo act.
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