I had posted as BB the hand before, no read.

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($71.95)
Button ($22.50)
SB ($47)
BB ($30)
Hero ($49.50)
MP ($47.60)

Preflop: Hero is UTG with A, K.
Hero raises to $2, 1 fold, CO calls $2, 2 folds, BB calls $1.50.

Flop: ($6.25) 3, 7, K (3 players)
BB checks, Hero bets $5, CO folds, BB raises to $28, Hero ???

If villain was any shorter this would be super easy call. I have a feeling fnord will say call and eurpho will say he has a set here every time. Any thoughts?