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sarNie Oldmaid
B1A4 - Stands for Be the One, All for One
It also stands for one member is blood type B and the other four are type A
Credit: B1A4.com
Members:
Jinyoung - Leader, Lead Vocalist
Birth Name: Jung Jin Young
Birth: November 18, 1992
Blood type: A
Height/Weight: 178cm/59kg
CNU - Vocalist, Rapper
Birth Name: Shin Dong Woo
Birth: June 16, 1992
Blood type: A
Height/Weight: 182cm/64kg
Sandeul - Main Vocalist
Birth Name: Lee Jung Hwan
Birth: March 20, 1993
Blood type: A
Height/Weight: 178cm/62kg
Baro - Main Rapper
Birth Name: Cha Sun Woo
Birth: September 5, 1993
Blood type: B
Height/Weight: 178cm/63kg
Gongchan - Maknae, Vocalist
Birth Name: Gong Chan Shik
Birth: August 14, 1994
Blood type: A
Height/Weight: 181cm/60kg
I didn't think I'd like them because they're so young and thought...ergh, what can they bring to the table? but I'm liking their music.
It also stands for one member is blood type B and the other four are type A

Credit: B1A4.com
Members:
Jinyoung - Leader, Lead Vocalist
Birth Name: Jung Jin Young
Birth: November 18, 1992
Blood type: A
Height/Weight: 178cm/59kg
CNU - Vocalist, Rapper
Birth Name: Shin Dong Woo
Birth: June 16, 1992
Blood type: A
Height/Weight: 182cm/64kg
Sandeul - Main Vocalist
Birth Name: Lee Jung Hwan
Birth: March 20, 1993
Blood type: A
Height/Weight: 178cm/62kg
Baro - Main Rapper
Birth Name: Cha Sun Woo
Birth: September 5, 1993
Blood type: B
Height/Weight: 178cm/63kg
Gongchan - Maknae, Vocalist
Birth Name: Gong Chan Shik
Birth: August 14, 1994
Blood type: A
Height/Weight: 181cm/60kg
I didn't think I'd like them because they're so young and thought...ergh, what can they bring to the table? but I'm liking their music.