K-Qs preflop dilemma

$1-$2 Hero is SB with K-Qs, MP has been tight passive preflop and fairly aggro post. MP2 has been very aggressive with a 20% pre flop raising rate, and aggro on flop too.

MP limps, MP+1 raises, hero calls, MP 3 bets, MP+1 caps, hero calls

Flop: K 7, 2 rainbow(no backdoor available). Hero checks (planning a check-raise from a single bet), MP bets, MP+1 raises, hero folds.

My main question is what should I be doing preflop? 3 bet the first bet? Should I be folding after the initial cold-call once it’s been re-re-raised?
Also how is the flop fold?