[Pansy-Mae]

Yes I know that PM is useful and powerful in changing the entire body, but what if i do take it and stop after a year or so when i achieved what I wanted, it's not like i'll have to take it for the rest of my life right?

Bottom line is yes almost certainly you'll need a permanent maintenance dose if you want to maintain what you've developed.
If you don't mind getting flatter and possibly saggy, then you could stop completely, in which case the fat deposits will go back where they came from and leave you with whatever is left.

Pansy Mae