Seventeen is a well known mafia group, one of the most dangerous at that.

Choi Hansol, or Vernon is the head of poison and planning, as he's quite smart and knows how to work with technology. Vernon is calm, observant, cold yet rather someone with a way of words, Vernon is also quite blunt but just more so calm if anything, yet can be a bit of a smartass and a bit dickish - but hes tough.