too thin / will i get cr bluffd here?

[shootaa]

villain is Erdnase, i dont have any stats but i fired up about 4 tables so start and he was on 3 of em with decent stacks (250bb), and from what ive seen, he's been playing pretty aggro.

PokerStars No-Limit Hold'em, $4 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

CO ($414.10)
Hero ($408.95)
SB ($396)
BB ($638.55)
UTG ($1367.10)
MP ($18.30)

Preflop: Hero is Button with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">UTG raises to $16</font>, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $56</font>, <font color="#666666">2 folds</font>, UTG calls $40.

Flop: ($118) J[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, Hero checks.

Turn: ($118) T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets $54</font>, Hero calls $54.

River: ($226) K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, Hero ?