Villain is 26/21/9.8 (3b)
I got the impression that he was aggressive
while he wasn't check/raising a lot of flops, I think he's more likely to do it with a real polarized range like sets/flush draws and air rather than with like a top pair hand
especially on a flop that has no connected cards that is just so attackable

now, he does not have any hands other than sets that would give me a ton of trouble because if he is raising a flush draw he is already losing to me since I have ace high backdoor

if he is turning a pair into a bluff, then I my plan is to bet the turn when he checks to me and take it down
however, I got a really nice turn and he bet into me
again, I didn't think he'd have a king, so unless he has a set I am ahead of his entire range because now I beat his pocket pairs

Full Tilt No-Limit Hold'em, $1.00 BB (6 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

Button ($216.90)
SB ($101.85)
BB ($31.80)
UTG ($100)
Hero (MP) ($116.20)
CO ($131.90)

Preflop: Hero is MP with J, A
1 fold, Hero bets $4, 2 folds, SB calls $3.50, 1 fold

Flop: ($9) 8, 3, K (2 players)
SB checks, Hero bets $7, SB raises to $19, Hero calls $12

Turn: ($47) J (2 players)
SB bets $29, Hero calls $29

River: ($105) 7 (2 players)
SB checks, Hero checks

Total pot: $105 | Rake: $3