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CORTIS (코르티스) is a five-member South Korean boy group under BigHit Music that debuted on August 18, 2025 with the single “What You Want.” Their name stands for “COLOR OUTSIDE THE LINES,” representing individuality and breaking away from expectations. The members are Martin (leader), James, Juhoon, Seonghyeon, and Keonho (maknae). CORTIS is known for being deeply involved in creating their own music, choreography, and creative direction instead of following traditional idol roles. Their debut EP, COLOR OUTSIDE THE LINES, explores themes of self-discovery, freedom, and expressing your true identity. With a sound that mixes hip-hop, pop, rock, and alternative influences, CORTIS has quickly become known for their authenticity, energetic performances, and artistic vision. Their official fandom is called COER, symbolizing fans as the core of the group’s journey.