No read on this guy. How often am I beat here?

Ultimate Bet No-Limit Hold'em, $.10 BB (10 handed) FTR converter on zerodivide.cx

MP2 ($2.40)
MP3 ($4.05)
CO ($5.45)
Button ($4.38)
SB ($3.40)
BB ($8.70)
UTG ($17.90)
Hero ($10.20)
UTG+2 ($4.10)
MP1 ($38.77)

Preflop: Hero is UTG+1 with K, K.
1 fold, Hero raises to $0.5, UTG+2 calls $0.50, 3 folds, CO calls $0.50, 3 folds.

Flop: ($1.65) 5, 7, 7 (3 players)
Hero bets $1.2, UTG+2 folds, CO goes
all-in for $4.95,

Hero?