sb is unknown, I call the flop to not isolate myself against sets and betterhands. Turn I'm not sure if villain has here a bluffrange at all. If he has it would be smthing like 78 
:spade:, A4 types of hands. River is an easy fold imo.
Poker Stars, $0.25/$0.50 No Limit Hold'em Cash, 6 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.
BTN: $25.04 (50.1 bb)
SB: $55.50 (111 bb)
BB: $172.80 (345.6 bb)
Hero (UTG): $52.75 (105.5 bb)
MP: $50 (100 bb)
CO: $26 (52 bb)
Preflop: Hero is UTG with K
K
Hero raises to $1.50, 3 folds, SB calls $1.25, BB calls $1
Flop: ($4.50) 5 6 2
(3 players)
SB bets $3, BB calls $3, Hero calls $3
Turn: ($13.50) J (3 players)
SB bets $8.50, BB folds, Hero calls $8.50
River: ($30.50) 3 (2 players)
SB bets $42.50 and is all-in, Hero folds
Results:
Spoiler
$30.50 pot ($1.37 rake)
Final Board: 5 6 2 J 3
SB mucked and won $29.13 ($16.13 net)
Hero mucked K K and lost (-$13 net)
