I am around a 2-1 underdog and I am getting 2-1, so call? Or am I wrong?

PokerStars No-Limit Hold'em, $0.25 BB (6 handed) from (Format: Bet The Pot)

Button ($18.20)
SB ($26.05)
BB ($7.90)
UTG ($13.80)
MP ($14.65)
Hero ($24.40)

Preflop: Hero is CO with , .
UTG calls $0.25, MP calls $0.25, Hero raises to $1.5, 3 folds, UTG folds, MP calls $1.25.

Flop: ($3.60) , , (2 players)
MP bets $1, Hero raises to $3.75, MP calls $2.75.

Turn: ($11.10) (2 players)
MP bets $9.4 (All-In), Hero??

hmm i dont know
I'd fold flop or raise it to 5.60.

yes you may call this turn because of the gutshot with the Kings

I think it's a little optimistic to claim 15 outs here. One or both overcards may be counterfeited which leaves 7 flush outs and another 6 for the offsuit Ks and nines. If we throw in one for the overcards and one for the slim chance you have the best hand here you have your 15 outs but I think you are better off figuring 12-13 because of the possibility one or both straights may tie and your overs are counterfeited. That leaves you needing 2.5:1 best case to break even. You are getting 2.18:1. If you have a great read then go for it but otherwise the math isn't with you IMO. If you do call it isn't a huge mistake even if my math is correct so I could see some making this call and not losing sleep over it.

The problem is alot of guys at 25NL are going to push there with just the draw or even TPTK. I call.

I also pound him to death on the flop. Your flop raise is too small.