Unknown villain at 2nl zoom.
Poker Stars, $0.01/$0.02 No Limit Hold'em Cash, 6 Players
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#32701862
BTN: $2.09 (104.5 bb)
SB: $3.47 (173.5 bb)
BB: $2.61 (130.5 bb)
UTG: $2.53 (126.5 bb)
MP: $2.09 (104.5 bb)
Hero (CO): $4.44 (222 bb)
Preflop: Hero is CO with 7

7
UTG raises to $0.07,
MP folds, Hero calls $0.07, 2 folds, BB calls $0.05
Flop: ($0.22) A

K

7
(3 players)
BB checks, UTG checks,
Hero bets $0.17,
BB folds, UTG calls $0.17
Turn: ($0.56) K
(2 players)
UTG checks,
Hero bets $0.42, UTG calls $0.42
River: ($1.40) Q
(2 players)
UTG bets $1.35, Hero??
What is correct when villain leads on this river?
Possible for villain to value bet Kx here? Missed FDs? JTcc?
Also assuming we're going with it, is there much of an EV difference between calling and sticking in the other 52c he has behind as he's got to pretty much call with any sort of value getting like 8.8 to 1 right?