Ak

Pre is good: UTG line indicates a pp or Axs hand that villain is happy to see a flop with.

Flop is good: UTG check/call line is weird, but we need to look at the possibilities. Sets, draws and decent Ax such as AQ, AJ are probable holdings. 65, 76, 87 are possible, but I would not expect a UTG player to have them often, unless his VPIP is particularly high.

Turn is weak: we need to charge draws and gain value for our hand. By checking we allow a draw to come in and we lose value for our winning hands. Villains play is also weak as his made set is under threat from the draws too, although having the 55 blockers to low draws helps him.

Flop: River shoves from these players inevitably end up being better than 1 pair hands. The flush draw came in, a set is getting max value and any 2 pair hand is now good. You MUST think why when calling these big river bets.