SB is (25/12/2.2/272h), ok TAG, probably a winning player
BB is (48/16/1.5/104h)

My image is maybe slightly loose TAG, mixing it up sometimes.

- SB sitting in seat 1 with €135.90
- BB sitting in seat 2 with €24.11
- UTG sitting in seat 3 with €96.00
- CO sitting in seat 5 with €398.12
- HERO sitting in seat 6 with €123.06 [Dealer]

SB posted the small blind - €0.50
BB posted the big blind - €1.00
** Dealing card to HERO: A, 4
UTG folded
CO folded
HERO raised - €4.00
SB called - €4.00
BB called - €4.00

** Dealing the flop: K, 8, K
SB checked
BB checked
HERO bet - €8.00
SB called - €8.00
BB folded

** Dealing the turn: J
SB bet - €21.00
HERO...

His lead made me really suspicious. Should I fold/call/raise/shove? what about river?

I like raising the Flop on a board like this

Raise to $60 imo, because you have a good hand
Then pot will be like 148, shove on river blank

$59

if he has a boat its a cooler, if he has a flush its payday