Lian 21 years old, 183cm, 66kg. Born December 25 (Capricorn), Type A, INFJ. The leader and lead vocalist of the 5-member Korean boy group "LUMIERE." Known as the "Prince of Moonlight." Since childhood, he was always relied upon and took it for granted that he had to be the "reliable one," making it difficult for him to show weakness. He studied dance and vocals since his student days. During his trainee years, he earned trust as a confidant for his peers, leading to his selection as leader. He initially worried that Leon, the ace, was better suited for the role, but Leon's words—"I can only follow you"—pushed him to accept the responsibility. He is gentle, inclusive, and possesses a sense of responsibility that puts his teammates first. His motto is "Shining as five is better than one shining alone," and he wishes for LUMIERE to be the place where everyone feels safest returning to. Supported by his friends, he continues to walk the path not as a perfect leader, but as a prince who grows alongside them.

Leon 22 years old, 186cm, 72kg. Born August 10 (Leo), Type O, ENFJ. The main dancer, main vocalist, and performance center of "LUMIERE." The ace known as the "Prince of the Sun." He worked tirelessly toward his dream of becoming an idol since childhood, but he recognized his younger brother Noa's talent earlier than anyone and gave up his path to becoming a trainee first. Though he later became a trainee himself and sincerely celebrated Noa being chosen as the center, he also felt the frustration of being "surpassed by his younger brother." Nevertheless, he turned that inferiority complex into hard work, practicing more than anyone else. He is passionate, caring, and a natural-born charismatic who values protecting his teammates above all else. With the motto "Seeing the best view as five is better than being a lone star," he supports the group alongside Lian, learning the strength of mutual support while illuminating his brother and teammates.

Noa 20 years old, 181cm, 63kg. Born February 28 (Pisces), Type AB, INFP. The center, lead vocalist, and lead dancer of "LUMIERE." Known as the "Glass Prince." He aspired to be an idol out of admiration for his older brother, Leon, and became a trainee with the support of his brother who recognized his talent. He was selected as the center for his delicate expressive power, transparent singing voice, and overwhelming presence that captivates people. While gentle and sensitive, he has a strong core and does not easily compromise his beliefs. Carrying guilt over his brother putting his own dreams on hold for him, he strives not to "surpass his brother" but to "stand shoulder to shoulder with him." With the desire to be someone who can gently light up someone's heart, he grows from a "protected younger brother" into the "center who supports LUMIERE."

Yuri 21 years old, 180cm, 63kg. Born April 3 (Aries), Type B, ESFP. Sub-vocalist, rapper, and in charge of performance for "LUMIERE." Known as the "Prince of the Spring Breeze." He lost his parents at a young age and grew up in an orphanage. He was a child who couldn't smile in front of others, but after performing song and dance for the children at the facility and seeing their smiles, he realized that music and dance have the power to make people happy. Making others smile became his life's goal. He is a bright and friendly mood maker, but he also possesses the strength to smile while hiding his loneliness. He became best friends with Leon, whom he met during their trainee days, and found a true sense of belonging in LUMIERE. Believing that "smiles have the power to save people," he aims to be a beacon of hope for his teammates and fans, growing as he learns to accept being supported as much as he supports others.

Eiden 23 years old, 185cm, 70kg. Born November 18 (Scorpio), Type A, INTJ. A returnee born in Korea and raised in Canada. Main rapper and sub-vocalist of "LUMIERE." Known as the "Ice Prince." Calm, collected, and a perfectionist who is strict with both himself and others. He has worked hard since childhood and became a trainee in Korea, but he has always viewed Leon, who was always a step ahead, as his greatest rival. Using his frustration as fuel, he continued to hone his skills, building a relationship where they recognize and elevate each other. Though logical and a man of few words, he possesses a clumsy kindness, treating those he has high expectations for with more severity; once he accepts someone as a teammate, he never abandons them. With the motto "Only skills grasped through effort become true confidence," he aims to become a powerhouse standing alongside Leon and lead LUMIERE to the top of the world. Through meeting his teammates, he grows by learning the strength of mutual support over solitary excellence.