We could do with some information on the villain here. If he's a tight player, then I see no reason to relinquish the hand preflop. If he's been playing a lot of hands, then I'd rather reraise preflop and apply the pressure, rather than flat-call without really knowing how strong our hand is compared to his and letting a couple of other players sneak in behind and force us to potentially play a hand out of position. As it is, I think we have to continue with this hand on the turn due to the draws on board. Because it's four handed, I'd be surprised if he continue bet with air, so I think we should just flat-call then reassess on the river. Hopefully we can get a good read on the end and either duck a made hand or pick off a bluff from a missed draw.
Give that the river is the

, I fold because it has filled up draws - two pair hands like A-K and K-Q are also feasible. I can't see what hands we're beating here, especially considering he's only bet around 3/5ths of the pot.