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Bolbbalgan4 (, also known as BOL4 or Blushing Youth) is a South Korean duo 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 meaning of 사춘기(思春期) is "puberty" in English. In Korean, the pronunciation of 사(思) is the same as 사(四=4), so the group name is sometimes shortened to Bol4. On April 2, 2020, Shofar Music announced that Woo Ji-yoon had left the duo, and Ahn Ji-young will continue to promote as Bolbbalgan4.

BOL4 consists of members Ahn Ji-young and Woo Ji-yoon. Both of them were classmates and been dreaming as a singer. Then, they appeared on Superstar K6 in 2014 which lead them signing with Shofar Music. They debuted in 2016 with the single "Fight Day" and becomes success with their dreamy concept.

Galaxy - Full Album RED PLANET

To My Youth - Red Diary Page.1

Travel - Red Diary Page.2

Some - Red Diary Page.1

"Best Entertainer Award - Asia Artist Awards - 2017

Song of the Year - Korean Music Awards - 2017

Digital Bonsang - Golden Disc Awards - 2018

Top 10 Artists - Melon Music Awards- 2018

Bonsang Award - Seoul Music Awards - 2018 "

Social media

Official Website : http://shofar-music.com/blush

Facebook : https://www.facebook.com/bolbbalgan4

Instagram : https://www.instagram.com/official_bol4/

Twitter : https://twitter.com/BOL4_Official