Hand converted with online PokerStrategy.com hand converter:
$0.1/$0.25 No-Limit Hold'em (5 handed)
Known players:
[tg]CO$56.72:///////;BU (Hero)$26.52:///////;SB$28.33:///////;BB$28.14:///////;MP3$72.48:///////;[/tg]
Preflop: Hero is BU with J:d, K:d.
MP3 folds, CO raises to $0.75, Hero calls $0.75, 2 folds, BB folds.
Flop: ($1.85) 6:c, 4:d, 5:d (2 players)
CO bets $1.32, Hero raises to $4.00, CO calls $2.68.
Turn: ($9.85) 7:h (2 players)
CO checks, Hero checks.
River: ($9.85) 3:d (2 players)
CO bets $4.68, Hero calls $4.68.
Final Pot: $19.21.
Results follow:
Hero shows a flush, king high(Jd Kd).
CO shows a straight, eight high(5c 8c).
Hero wins with a flush, king high(Jd Kd).
Spoiler

Hello,
We are little behind on his range and he is Cbetting much. Moreover WTSD 36, and he is not cb/folding much with this sample. Thats why we should fold PF?
As played, we should rather just call that raise, because we have pretty good equity on his range, and we isolate ourselves by raising. I have no idea, who didnt I raising the river targeting his straights, its a big mistake
What do you think?