I think it's one of Taeju's siblings? I remember being mentioned that he has siblings even tho they never appeared so it might be someone who's not "in crime" or something.
Ooh .thanks its been so long so like i got confused with how they got close .and with so many new characters i kinda got confused . But thank s(⌒▽⌒) Nobi
indeed i was literally so damn confused too I'm like wait what? who's who now?! ┑( ̄Д  ̄)┍
Octopus?
Shoji who fought spinner