Bolbbalgan4 (빨간사춘기), also known as BOL4 is a South Korean musical act formed by Shofar Music in 2016. BOL4 was originally a duo consisting of Ahn Ji-young and Woo Ji-yoon. On April 2, 2020, Shofar Music announced that Woo Ji-yoon had left the duo, with Ahn Ji-young to continue promoting as Bolbbalgan4. Links: Website, Twitter, Instagram, Youtube

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