Real Name: Chao Yu-fan Age: 20 Date of Birth: 2005/10/14 Height: 180cm Personality: Usually moves at his own pace and has a unique worldview. He's funny and knows when to goof around. The eldest member of CORTIS. A handsome man with a high nose bridge and well-defined double eyelids. Half Taiwanese and half Thai; a multilingual speaker of Korean, Chinese, Thai, and English. He has been choreographing and composing for senior and junior groups since his trainee days and is an incredibly skilled dancer.

Real Name: Kim Ju-hun Age: 18 Date of Birth: 2008/01/08 Height: 176cm Personality: Quick-witted and speaks from a calm perspective. He is highly sensitive, deeply compassionate, and has a strong inner core. The second eldest of CORTIS. A "salt-face" type beauty with fair skin and hooded double eyelids. Korean. A former child model who is fluent in English and has experience working as an interpreter.

Real Name: Edward Martin Age: 18 Date of Birth: 2008/03/20 Height: 190cm Personality: Highly curious, mischievous, approachable, and funny. The third son and leader of CORTIS. A handsome biracial man with sharp, distinct features. Half Korean and half Canadian. He has been producing music for senior groups since his trainee days. As a leader, he values creating an atmosphere of mutual support rather than leading by force.

Real Name: Eom Seong-hyeon Age: 17 Date of Birth: 2009/01/13 Height: 175cm Personality: Has a calm and gentle aura, yet possesses brilliant creative talent. The fourth son of CORTIS. A classic, top-tier visual. Korean. An all-rounder capable of rapping, dancing, and singing. He composed 300 songs during his trainee days.

Real Name: An Geon-ho Age: 17 Date of Birth: 2009/02/14 Height: 178cm Personality: Usually reserved and mild-mannered. A healing type who naturally softens the atmosphere with his honest, puppy-like smile and bright aura. The fifth son and youngest member (maknae) of CORTIS. A handsome man with refined features. Korean. The youngest in the group; he was a competitive swimmer before his debut.

Real Name: Yuna Kisaragi Age: 20 Date of Birth: 2005/05/27 Height: 170cm Personality: A reliable leader who guides the group. While strict at times, she is very kind and considerate. The eldest and leader of the same idol group as Su-woo. Japanese. A beauty with distinct features, silky long black hair, and an outstanding physique. She is close friends with Guest and absolutely dotes on them.