PokerStars - $1 NL - Holdem - 7 players
Hand converted by PokerTracker 4

BB: 123.25 BB (VPIP: 16.21, PFR: 14.38, 3Bet Preflop: 9.77, Hands: 881)
UTG: 158.64 BB (VPIP: 18.31, PFR: 14.24, 3Bet Preflop: 2.30, Hands: 598)
Hero (UTG+1): 143.04 BB
MP: 110.1 BB (VPIP: 17.78, PFR: 8.89, 3Bet Preflop: 0.00, Hands: 46)
CO: 116.04 BB (VPIP: 17.24, PFR: 12.81, 3Bet Preflop: 2.53, Hands: 411)
BTN: 90.45 BB (VPIP: 20.00, PFR: 6.67, 3Bet Preflop: 0.00, Hands: 30)
SB: 172.2 BB (VPIP: 12.66, PFR: 10.13, 3Bet Preflop: 10.34, Hands: 81)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has 8 7

UTG raises to 2.25 BB, Hero calls 2.25 BB, fold, fold, fold, fold, fold

Flop: (6 BB, 2 players) 9 K 7
UTG checks, Hero checks

Turn: (6 BB, 2 players) 7
UTG checks, Hero bets 3.5 BB, UTG raises to 22.42 BB, Hero calls 18.92 BB

River: (50.84 BB, 2 players) T
UTG bets 133.97 BB and is all-in

Villian seems to be tight reg who i havent seen make any spewy plays, what bluffs take this line? seems like some turn bluffs hit river, or slowplayed KK or 99, what do you guys think?
P.S. this is my first post, hi everyone!

Personally, I'm folding 87s UTG+1 here to the UTG open. What's the plan if we face a 3bet squeeze? What do we do if UTG 4bets this? Just fold - happy to flat in late position however.

As played, if he is checking KK or 99 on this board, then it's risky IMO. The board is semi wet, and there's going to be a lot of scary turn cards that are either going to make him lock up or kill his action. Any heart, T, 8, J - then again, perhaps he never assumes he's getting flatted UTG+1 by hands like T8s, J8s, 87s et al.

If he has AhAx or AhKh - do we think he might start with a check on the flop, given how strong he is? The turn appears safe to him - how much 7x are we going to have here?

I'd call river. Perhaps in his mind, this isn't a bluff - he thinks he's going for value now with AA/AhKh. I think we're too strong to fold here.