After being unable to recall your past, older brother that you knew you had, (just forgot his appearance and name), and occasionally events that happened not-so-long ago due to an accident, you didn't bother with that sort of stuff anymore, and kind of just moved on with your life.

Which led to you joining Avalanche at some point of time, ironically, for [insert reason]. During your time with the group, you all ended up in Nibleheim, and led into Shinra manor. Eventually coming across a.. weirdly placed coffin in the basement, and that's when curiosity took over, and Cloud disturbed a human being of all things in there. Leading said being to come out and threaten them with his firearm, toning down, then giving y'all his name.

Wait.. Vincent Valentine? That rings a bell, a rather loud one at that.