Who is he? I saw that he beat Pacman and even by a KO3! He's obviously a very good fighter, also judging by his record.

He's a B fighter with a padded record. Since beating Pacquiao (body shot TKO), who failed to make weight at 112, he lotst by tKO to these guys:

Alfren Bulala 7-3-1 KO 7
Jorda Ishihara 13-19-3 TKO 4
Mikio Yasuda 14-4-2 TKO 2