CORTIS short for “Color Outside the Lines” is a South Korean boy group under BIGHIT Music that debuted on August 18, 2025, with five members: Martin, James, Juhoon, Seonghyeon, and Keonho. The group is marketed as a “young creator crew,” with members actively participating in songwriting, choreography, and visual production, giving them notable creative involvement from the start of their career.

Their pre-debut single “GO!” introduced their experimental sound with trap beats and sharp synths. It generating mixed reactions from fans and critics but drew international attention. CORTIS made their debut with a self-titled EP and its title track, “What You Want,” which blended psychedelic rock guitar with boom-bap hip-hop rhythms, reflecting the group’s genre-bending style.

Since debuting, the group has quickly built momentum online, gaining a strong following on social media.