Beast berasal dari label Cube entertainment, memulai debut pertamanya pada tanggal 15 Oktober 2009 yang sebelumnya tanggal 14 Oktober 2009, album mereka keluar (Beast is The b2st). Berikut adalah profil lengkap member B2ST:
Yoon Doo Joon
Position : leader, rapper
Nick name : 3 sec sharing
DOB : 4 Juli 1989
Education : kyung hee cyber university
Height : 180 cm
Weight : 61 kg
Blood Type : A
Specialty : vocals, rap, soccer
Hobbies : listening to hip hop + r&b, soccer, and playing games
Son Dong Woon
Nickname : sonseuko, 16D
DOB : 6 Juni 1991
Education : Hanyoung High School
Height : 181 cm
Weight : 64 kg
Blood Type : A
Specialty : Piano, chinese
Hobbies : writing lyrics, reading books...
Lee Ki Kwang
Stage name/ Nick name : AJ (ace junior) / holly 2
DOB : 30 Maret 1990
Height : 174 cm
Weight : 58 kg
Education : seoul art college
Blood Type : A
Specialty : Dancing
Hobbies : watching movies, sports, excercising, dancing
Yang Yo Seob
Nick name : Yang yo, Siksin, endorphins
DOB : 5 Januari 1990
Education : Dong-ah institute of media and arts
Height : 174 cm
Weight : 54 kg
Blood Type : B
Specialty : vocals, beatbox, eating well
Hobbies : writing lyrics
Jang Hyun Seung
Nick name : So-1 / lancho (rancho)
DOB : 3 September 1989
Height : 176 cm
Weight : 58 kg
Education : ansan information industry high school (graduated)
Blood Type : B
Specialty : beatbox, working hard
Hobbies : bowling, web surfing
Yong Jun Hyung
nick name : poppin’ dragon/ yong goon
Education : anyang art high school (graduated)
DOB : 19 Desember 1989
Height : 179 cm
Weight : 64 kg
Blood Type : O
Specialty : dancing
Hobbies : writing lyrics, watching movie
