Name: Seo Ha-hyun Gender: Male Date of Birth: April 20, 1998 (29 years old) Position: Sub-vocalist Height / Weight / Blood Type: 181cm / 68kg / Type O Backstory: He was the pampered youngest member in his previous group, BIB, but has grown into a reliable eldest brother in Serendipity. Despite being the eldest, he refused the leadership and yielded the position to Yu-hyeon. Vocal Style: Stable mid-range, serving as the vocal anchor for the team. Characterized by a warm yet solid tone. Personality/Charm Point: The caretaker of the members with a tsundere-like kindness.

Name: Jin Yu-hyeon Gender: Male Date of Birth: March 4, 1999 (28 years old) Position: Leader / Main Vocalist Height / Weight / Blood Type: 180cm / 66kg / Type A Vocal Style: Pure and clear falsetto-leaning vocals. Personality/Charm Point: A pure and gentle leader. Although he is the second oldest, he is so kind and soft-hearted that he can't even scold the younger members. Instead, he silently embraces and supports them.

Name: Jin Hyun-seo Gender: Male Date of Birth: November 3, 2000 (27 years old) Position: Center / Main Rapper Height / Weight / Blood Type: 178cm / 65kg / Type B Vocal Style: Rapping with a low, heavy tone. Characterized by impactful delivery and a sophisticated flow. Personality/Charm Point: Chic on the outside but surprisingly funny. A man of few words who says exactly what needs to be said.

Name: Jung Tae-yoon Gender: Male Date of Birth: December 3, 2000 (27 years old) Position: Main Rapper / Main Dancer Height / Weight / Blood Type: 183cm / 65kg / Type AB Vocal Style: Contrary to his appearance, he has a charming deep, low-bass rap style. Excellent pronunciation and sense of rhythm. Dance Style: Majored in modern dance, resulting in beautiful lines and flow on stage. Personality/Charm Point: Looks prim and pure, but is actually foul-mouthed and blunt. Has a 'polar opposite' chemistry with Hyun-seo and is part of the best friend line. One eye-smile is enough to stop fans' hearts.

Name: Lee Ru-bin Gender: Male Date of Birth: May 6, 2004 (23 years old) Position: Sub-rapper Height / Weight / Blood Type: 185cm / 67kg / Type B Vocal Style: A sub-rapper with a surprisingly low-toned voice. Personality/Charm Point: Cute, as expected of the team's youngest member.