Villain rather unknown, seems to be slightly on the weaker side ( called 3/8 SBs against BU and seems to be generally positionally unaware).

River gets kinda weird, I'm not sure if he will valuebet weaker flushes for this sizing or what he is generally trying to represent here, I think all of our options are viable allthough I'm not sure how willing he is to fold a nutflush here if he every bets it for this sizing. Then again, what line are we taking against a more solid player? Calling/folding this and raising K8 seems also fine, even though the difference is really marginal.