Solo Artist · The BigHit group that writes and produces its own records
Holds writing credit on 12 of 12 tracks
Yes, and all five members do. Across the twelve tracks on both EPs, Martin holds a writing credit on all twelve, Seonghyeon on eleven, Keonho and Juhoon on ten each and James on seven. Martin also produces five, which is unusual for a group two years past debut.
Across all 12 tracks: how many Cortis wrote alone, how many they co-wrote, and how many were written by others. The bracket marks every track they hold any writing credit on.
Share of all 12 tracks where they are personally credited, by role.
Percentage of all 12 tracks, across every album, where each member holds a credit - split by role.
| Member | Period | Lyrics | Music | Production | Performance |
|---|---|---|---|---|---|
| James | 2025-present | 58% |
58% |
8% |
100% |
| Juhoon | 2025-present | 83% |
83% |
0% |
100% |
| Martin | 2025-present | 100% |
100% |
42% |
100% |
| Seonghyeon | 2025-present | 92% |
92% |
8% |
100% |
| Keonho | 2025-present | 83% |
83% |
0% |
100% |
Cortis's writing credit per album, in release order. Hover any bar for the album.
Where Cortis sits on the scale from a pure performer (0%, sings songs written by others) to a complete author (100%, writes everything). The bright marker is their catalogue authorship score, plotted against other artists on the site.
Reference artists spread across the scale, closest by genre and era.
Cortis had released no studio album as of August 2026, so this page covers both of their EPs: Color Outside the Lines (2025) and GreenGreen (2026). Both are typed as EPs rather than albums. Member legal names come from the Korean Wikipedia article. James is Taiwanese and his name is published there only as 趙雨凡 with the Korean reading beside it; no Latin-script romanisation appears in any source checked, so it is recorded as published.
No albums from this decade.
Cortis12 tracksBubble size = tracks worked on together. SB Supreme Boi · HN Hiss Noise · "B "Hitman" Bang · SP Slush Puppy · ZF Zach Fogarty · N Nami
Data Insight
Every member writes. Across the twelve tracks on both EPs, Martin holds a writing credit on all twelve, Seonghyeon on eleven, Keonho and Juhoon on ten each and James on seven, and Martin also takes production credits on five. For a group assembled by a label two years ago that is unusual: the comparison inside their own company is BTS, where the writing concentrates in the rap line. Hiss Noise and Supreme Boi are the outside constants, on all twelve and eleven respectively.
Quick Facts
Creative Fingerprint
A self-writing idol group: all five members hold writing credits across both EPs, Martin on every track, and he produces five of the twelve.
The Story
Cortis is a South Korean boy band formed by BigHit Music in 2025, made up of James, Juhoon, Martin, Seonghyeon and Keonho. Their debut EP Color Outside the Lines arrived in September 2025 and entered the Billboard 200 at number 15, the second-highest debut ever for a K-pop act. The follow-up GreenGreen came in May 2026, and its single 'RedRed' reached number one on South Korea's Circle Digital Chart, their biggest commercial success. They were nominated for Best New Artist at the 2026 MTV Video Music Awards.