Villain is new to the table.

PokerStars No-Limit Hold'em, $2 BB (5 handed) Converter Tool from (Format: Bet The Pot)

UTG ($305.90)
Hero ($200)
Button ($120)
SB ($198)
BB ($330.75)

Preflop: Hero is MP with , .
1 fold, Hero raises to $6, Button calls $6, 2 folds.

Flop: ($15) , , (2 players)
Hero bets $12, Button raises to $24, Hero?