Game is 10/25 HKD (roughly 2/4$)

Loose on preflop, most hands are multiway. And fairly aggressive game with lot of check-raising on flop.

Villain is 25ish asian who has foreign education. Regular at the stakes, I see him play always when I'm there. Very aggressive, never limps, cbets frequently and bluffs bit too much. I'd suspect he is marginal winner or breakeven due to the fact he overplays too many weak hands. This time he is clearly tilted, he has lost 3 buy-ins on some nasty spots he has caused to himself by overplaying his hand. (shoved QQ on TT4 board vs TT, called a shove on 3 to flush board with a set)

Villain sees me as TAG and considers me a long term winner but thinks I play too tight (he has said this sometimes during our out of table talks)

Villain stack is roughly 5k
Hero stack is roughly 7k

Villain raises 75 from UTG
3 people call
Hero calls from button with J9
blinds call

Pot 450
Flop: KJ9

Checked to me, I bet 300, blinds fold and Villain re-raises to 925, others fold.

What would be best course of action on flop?

I call the remaining 625

Pot: 2300
Turn card is K
Villain bets 1400
I fold thinking that is the worst card possible in the deck for me...

Is folding a best course of action on the turn?

Real tough spot to be in. As played I would call turn and see if he continue betting big on the river. If he gonna bet big again on river I'll prob fold. If he checks I'll prob bet for value. Share the outcome w us ok? He might be on tilt

First, don't post results for specific spots you have a question about (i.e. asking what to do OTF then telling us in the same post what you did). Second, I think it was standard. Calling OTB with J9s might be marginal against a competent LAG who's raising UTG, but other than that I think the rest of the hand was fine.

What are you beating that he's c/r'ing with? AQ that decided to make a move? That's about it. You're losing to KK, KJ, QT, AK, KQ, AA, JJ, 99. I don't see villain ever c/r'ing with a worse hand than that. If he is, don't leave the table because his stack will be gone soon.

A player who c-bets frequently suddenly decides to check raise.. hmmmm yeah. fold flop, fold turn.

I almost did, but I also thought he has fair chunk of pair+draw in his check-raise range and I don't think he would check-raise a made straight since flop connects to lot of people calling range.

As played and I mucked the turn, he proudly showed 76 pure airball...

Shrug, terrible bluff, burning tons of money. Dont even put him past a breaking even player. I wouldnt let this hand bother you.

K isn't a terrible card because V isn't c/r AA/AK/KQ on the flop. It adds a blocker to KJ/KK.

I'm half tempted to fold to the flop c/r, but I don't think I would fold to the turn bet.

Turning our hand into a bluff is correct because V will show up with weird JT/JQ hands a significant amount of the time but cannot call a raise OTT.

on the flop, I think calling is the worst of three options.
if you thought you were beat, you should have folded.
if you thought you were ahead, you should have re-raised him.
the only time I like calling is if you've got the nuts and you want to induce more betting.
calling with bottom two on a draw-heavy board rarely produces a good result - too many cards in the deck hurt or counterfeit your hand.
if you were sure he didn't have QT or KJ - then a 3-bet to 1900 (or more) would have been the right move (with intentions of calling an all in shove).