Villain is a halfstacker. He acted after about 3 seconds on the turn and river. no other reads

PokerStars No-Limit Hold'em, $4.00 BB (8 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

Button ($213)
SB ($384.90)
BB ($450.20)
UTG ($400.70)
UTG+1 ($431)
Hero (MP1) ($400)
MP2 ($500.10)
CO ($224.20)

Preflop: Hero is MP1 with J, J
2 folds, Hero raises to $12, 1 fold, CO calls $12, 3 folds

Flop: ($30) 8, Q, 6 (2 players)
Hero bets $20, CO calls $20

Turn: ($70) 5 (2 players)
Hero checks, CO bets $48, Hero calls $48

River: ($166) 2 (2 players)
Hero checks, CO bets $120, Hero