Real Name: Guk Chorok Nationality: South Korea Date of Birth: July 28, 2005 Position: Rapper, Lead Dancer Personality: Easygoing and full of energy, she leads the bright atmosphere within the team. Characteristics: She has the surname 'Guk,' which is very rare in South Korea, and is part of the group's eldest line. Trivia: She is a former contestant of the JTBC audition program "R U Next?". She expressed her bold ambition to be recognized for the group's unique identity rather than any other labels.

Real Name: Shin Hyewon Nationality: South Korea Date of Birth: October 5, 2005 Position: Vocalist Personality: While she is cautious and calm, she has a reversal charm with her intense immersion on stage. Characteristics: She is a 're-debut' member who previously promoted under the stage name 'Lael' in the child idol group 'Rich Girl.' She boasts a unique vocal color and stable singing ability. Trivia: A former Belift Lab trainee, she has an impressive history of participating in "R U Next?" alongside Cho Hyejin and Guk Chorok.

Real Name: Cho Hyejin Nationality: South Korea Date of Birth: October 5, 2005 Position: Leader, Main Dancer, Vocalist Personality: An inclusive type who takes care of the members like a reliable father figure (MBTI: ENFJ). Characteristics: The final winner of the KBS audition program "The Entertainer" and a highly skilled dancer who appeared on Mnet's "Street Dance Girls Fighter 2." Trivia: A graduate of the Practical Dance department at Hanlim Arts High School, she received high praise from Park Jin-young, who called her "so special."

Real Name: Kawasaki Yuu Nationality: Japan Date of Birth: August 21, 2008 Position: Vocalist, Dancer, Rapper Personality: Contrary to her cute appearance, she possesses strong grit and never gives up in any moment. Characteristics: After appearing on SBS's "Universe Ticket," she proved her solid skills by placing 3rd in the finals of KBS's "The Entertainer." She is an ace who handles singing, dancing, and rapping. Trivia: She built a global fandom early on by going through two survival programs before her debut.

Real Name: Hsieh Chia-hsuan Nationality: Taiwan Date of Birth: February 10, 2009 Position: Main Dancer Personality: Like her name, she is baby-like and cheerful, but possesses a powerful reversal charm on stage. Characteristics: Along with leader Cho Hyejin, she serves as a core pillar of the team's performance. She holds a high center position in hip-hop-based stages and is known for her eye-catching dance lines. Trivia: She first became known as a unit member for the pre-debut single "HUNGRY (Side A)" released before the official debut.

Real Name: Achiraya Kamwinwit Nationality: Thailand Date of Birth: August 18, 2009 Position: Vocalist Personality: Possesses a unique and artistic sense and prefers a free-spirited vibe. Characteristics: She is the third Thai member from JYP Entertainment, following in the footsteps of Nichkhun and BamBam. Her charming voice tone adds an exotic and trendy feel to their songs. Trivia: A former Abyss Company trainee, she has experience performing on stage at senior artist BamBam's concert in Thailand before her debut.

Real Name: Takashima Kirara Nationality: Japan Date of Birth: December 17, 2010 (Maknae) Position: Vocalist, Maknae Personality: She is adored by the older members for her pure, maknae-like innocence and bubbly liveliness. Characteristics: She was the final hidden card revealed to complete the 7-member lineup. She is the member who best brings out the kitschy charm of OURBIRTHDAY's unique 'Whip-Hop' genre. Trivia: Despite her young age, she is considered a promising prospect for individual fan-cams due to her excellent facial expressions on stage.