Is this line okay? Or should I just check call till the river?

PokerStars - $1.36+$0.14|100/200 NL - Holdem - 8 players
Hand converted by PokerTracker 4

Hero (BB): 4,085
UTG: 1,500 (VPIP: 20.50, PFR: 16.56, 3Bet Preflop: 10.87, Hands: 163)
UTG+1: 2,070 (VPIP: 9.43, PFR: 7.69, 3Bet Preflop: 6.25, Hands: 53)
MP: 2,080 (VPIP: 12.28, PFR: 10.53, 3Bet Preflop: 10.00, Hands: 59)
MP+1: 1,725 (VPIP: 17.24, PFR: 17.28, 3Bet Preflop: 6.45, Hands: 89)
CO: 10,750 (VPIP: 28.79, PFR: 9.38, 3Bet Preflop: 10.34, Hands: 69)
BTN: 4,220 (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 4)
SB: 970 (VPIP: 10.76, PFR: 5.30, 3Bet Preflop: 1.79, Hands: 159)

SB posts SB 100, Hero posts BB 200

Pre Flop: (pot: 300) Hero has 2 9

fold, fold, fold, fold, fold, BTN calls 200, fold, Hero checks

Flop: (500, 2 players) K K 9
Hero checks, BTN checks

Turn: (500, 2 players) 8
Hero checks, BTN bets 200, Hero raises to 525, BTN calls 325

River: (1,550, 2 players) 5
Hero checks, BTN bets 600, fold

yeah, I probably just call the hand down.

C/r on turn makes no sense. Better off leading it, fold if raised. Will control the pot size better and give you a chance to see a cheap/free river.

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This, or take the check / call line.