NL2 KK fold on River

Hand converted with online PokerStrategy.com hand converter:

Hand abspielen

$0.01/$0.02 No-Limit Hold'em (9 handed)

Known players:
[tg]MP3$5.42:///////;CO$2.00:///////;BU$6.46:///////;SB$3.44:///////;BB$1.80:///////;UTG1$0.94:///////;UTG2$2.00:///////;MP1$0.93:///////;MP2 (Hero)$2.06:///////;[/tg]

Preflop: Hero is MP2 with K:d, K:c.
3 folds, Hero raises to $0.08, MP3 folds, CO calls $0.08, BU folds, SB calls $0.07, BB folds.

Flop: ($0.26) 7:h, 4:h, 5:s (3 players)
SB bets $0.06, Hero raises to $0.18, CO folds, SB raises to $0.30, Hero calls $0.12.

Turn: ($0.86) J:c (2 players)
SB bets $0.10, Hero calls $0.10.

River: ($1.06) 7:c (2 players)
SB bets $1.00, Hero folds, SB gets uncalled bet back.

Final Pot: $1.06.

Ist mein Fold am River richtig?
Gegner 3bettet am flop. Turn spielt er nur klein an und River bettet er Potsize.

68 hatte er wohl eher nicht. Vermute mal das er sein Set am Flop getroffen hat.