PokerStars No-Limit Hold'em, $0.05 BB (6 handed) - PokerStars Converter Tool from FlopTurnRiver.com

Villain is 23/15/3 after 73 hands; kinda passive post-flop so far

UTG ($2.51)
MP ($8.11)
Hero (CO) ($15.10)
Button ($12.51)
SB ($5.16)
BB ($5)

Preflop: Hero is CO with 7, 7
UTG calls $0.05, MP bets $0.20, Hero calls $0.20, 3 folds, UTG calls $0.15

Flop: ($0.67) 9, 7, 7 (3 players)
UTG checks, MP bets $0.45, Hero calls $0.45, 1 fold

I called here as I wanted him to lead Turn

Turn: ($1.57) K (2 players)
MP checks, Hero bets $1, MP calls $1

No luck. So...sizing here? I want to keep him in the hand LDO

River: ($3.57) 5 (2 players)
MP checks, Hero ???

Total pot: $3.57 | Rake: $0.17