Hero JaeJoong
Stage Name : HERO | Young Woong Jae Joong (영웅재중 or 英雄在中)
Real Name : Kim Jae Joong (김재중, 金在中)
Birthdate: January 26, 1986 (1986-01-26) (age 21)
Birthplace: Chungnam (충남 or 忠南)
Position: Middle vocal

U-Know Yunho
Stage Name : U-KNOW | U-Know Yun Ho (유노윤호 or 瑜卤允浩)
Real Name: Jung Yun Ho (정윤호, 鄭允浩)
Birthdate: February 6, 1986 (1986-02-06) (age 21)
Birthplace: Gwangju (광주)
Position: Baritone, Leader

Micky Yoochun
Stage Name : MICKY | Micky Yoo Chun (믹키유천 or 秘奇有天/秘奇有仟)
Real Name: Park Yoo Chun (박유천, 朴有天)
Birthdate: June 4, 1986 (1986-06-04) (age 21)
Birthplace: Seoul (서울)
Position: Bass-baritone

Xiah Junsu
Stage Name : XIAH | Xiah Jun Su (시아준수 or 細亞俊秀)
Real Name: Kim Jun Su (김준수, 金俊秀)
Birthdate: December 15, 1986 (1986-12-15) (age 20) (registered on January 1, 1987)
Birthplace: Gyeonggi (경기 or 京畿道)
Position: Baritenor
Religion: Seventh-day Adventist[24][25]

Max Changmin
Stage Name : MAX | Choi Kang Chang Min (최강창민 or 最强昌珉)
Real Name: Shim Chang Min (심창민, 沈昌珉)
Birthdate: February 18, 1988 (1988-02-18) (age 19)
Birthplace: Seoul (서울)
Position: Tenor
Religion: Buddhism[26]