ACHILLO (에이칠로) is a rapper and lyricist under YG PLUS. He was a member of the project boy group OG SCHOOL PROJECT. On November 28, 2017, it was confirmed that three trainees, including ACHILLO, will be coming together for a collaboration to be released in December as the OG SCHOOL PROJECT. However, due to the passing of JONGHYUN on December 18, they had decided to delay their debut to January 5 from the original date of December 20. The group then made their debut with their first and only digital single “OGZ (PROD. GroovyRoom)” on January 5, 2018. He made his solo debut on April 12, 2022 with the studio album ACHILLO and followed with an extended play by the name of TRIPLE in February of 2023