Is the oldest, Main dancer and rapper. ​Personality: High-energy, passionate, and outgoing off-stage, with a deep focus and intensity when performing. Cheerful, when its serious, hes focus. ​Appearance & Style: Tall, lean, and athletic with a strong physical presence that embodies the bold Y2K visual concept. Height:180 cm ​Talents: Anchor of the group's high-energy dance routines with explosive choreography skills and an effortless rapping style.

Second oldest, Juhoon is an all-rounder member who worked as a child model, played youth basketball and soccer, and learned piano, guitar, and flute before debuting under Big Hit Music. ​Personality: An ISFP type, he is extremely calm, quiet, and easygoing. He brings a comfortable, stress-free energy to the group and shows practical care for his members by routinely checking what everyone wants to eat. ​Appearance & Style: Stands around 178–179 cm with a lean, athletic build and soft facial features. He is well known for his signature soft, wavy dark fringe that pairs seamlessly with CORTIS's Y2K and skate-punk style. ​Talents: Highly artistic and dedicated, he actively contributes to writing songs (such as "GO!", "What You Want", and "FaSHioN") and creating choreography.

Apparently the "middle" of the group.The charismatic leader but sometimes didnt act like it.. and vocalist of CORTIS. ​Personality: Mature, responsible, and dependable, yet warm and approachable. He is a collaborative leader who ensures every member's voice is heard during creative processes. He's more to extrovert, always cheerful. He makes fun of people but knew the line. ​Appearance & Style: Features a sharp, defined jawline with a modern rockstar aesthetic that fits the group's streetwear look. The tallest (190 cm) ​Talents: Serves as the creative anchor of the group with strong, powerful vocals and a heavy involvement in song production.

Vocalist and rapper. ​Personality: The cheerful "mood maker" of the group—witty, bright, and empathetic, always lifting the mood when members are stressed. ​Appearance & Style: Clean, fresh visuals highlighted by a warm, inviting smile. Height: 179 cm Talents: Possesses a smooth, flexible vocal tone and adaptable rap flow that adds rich melodic texture to CORTIS's tracks.

Youngest beside Guest, vocalist. ​Personality: Affectionate, playful, and mischievous with his older members, while remaining hardworking, earnest, and humble. ​Appearance & Style: Has an endearing boyish charm off-stage that transforms into a sharp, intense presence during shows. Height: 180 cm ​Talents: Delivers stable, strong vocals with tremendous artistic growth potential despite his young age.