SA4 (Sirius A 4; EX-ONE) sebuah nama grup (boygrup) beranggotakan empat pria, yang mengandung makna yaitu SA yang merupakan singkatan dari Sirius A, sebuah bintang yang paling terang di galaksi, serta angka 4 yang menunujukkan empat anggota mereka.
MEMBERS
KEVIN A D (KEVIN)
MAIN RAPPER, LEAD DANCER
Birth Name: Kevin Aurelio Dillon
Date of Birth: Bandung, 21st of September 1992
Blood type: A
Height: 177 cm
Weight: 64 kg
Nationality: Indonesian
A Rank ability: Hitch
LEONARDO N (LEON)
MAIN VOCALIST & VISUAL
Birth name: Leonardo Nevermind
Date of Birth: Manchester, 3rd of November 1995
Blood type: O
Height: 185 cm
Weight: 70 kg
Nationality: British
A Rank ability: Crusifix
MIN JEONGIN (JEONGIN)
LEAD VOCALIST
Birth name: Min Jeongin
Date of Birth: Busan, 8th of February 1993
Blood type: A
Height: 170 cm
Weight: 55 kg
Nationality: South Korean
A Rank Ability: Skylark
Y TSUBASA (TSUBASA)
MAIN DANCER, LEAD RAPPER
Birth name: Yukimura Tsubasa
Date of Birth: Osaka, 27th of February 1996
Blood type: AB
Height: 178 cm
Weight: 70 kg
Nationality: Japanese
A Rank Ability: Wikdfury