Pre flop I think over call is fine given originally raiser is nitty even though BTN seems quite aggressive.

Flop check call here, check fold is for sure the worst option we have a straight flush draw we must at the very least see the turn and re asses.

As for the flop you certainly have way too much equity to just fold.

As for the preflop play, I really hate overcalling here. You're rarely more face-up in poker than you are when overcalling a 3bet in a spot like that. It's almost always something like 99-JJ, AQs and even fairly unsophisticated players have a fairly good idea where you're at. Honestly, unless either of the two players is a confirmed recreational, I feel that there's nothing wrong with just folding preflop especially given the 3bet sizing.

Are you showing a profit overcalling 3bs with JJ 100bb eff. in spots where you are not trapping vs aggros?