100NL six max
UTG is super solid tag player
BTN is unknown, bought in $200 (200bb). Site has person tagged as a "rock" meaning under 20% vpip. Have no other info.

UTG ($156) $3
MP folds
Hero ($120) AhKs $9
Btn cold calls
UTG calls

Flop ($28.5) Kc Js 2s
UTG check
Hero cbet $8.50 (30%)
Btn calls
UTG calls

Turn ($54) Kc Js 2s 9h
Utg check
hero checks (idk if I should bet here)
btn bets $40
Utg folds
Hero ($103) calls $40

River ($134) Kc Js 2s 9h 9s
hero ($63) checks
Btn all in.
Hero AhKs ?

Seems like a standard call blocking some flushes as well, but will they have like KQs here? QQ? AJs? AQs? I'm pretty lost what this person has here. JJ makes the most sense to me as it won't always raise the flop. I don't see any bluffs here, feels like I chop or lose....