10th hand in, no real reads but villain has not folded 1 hand and has 3bet me twice (folded both times)

I was planning to fold river to a value bet but on the overbet im thinking he is repping KK or nothing?

PokerStars Hand #83995750487: Hold'em No Limit ($0.25/$0.50 USD) - 2012/07/29 10:59:49 WET [2012/07/29 5:59:49 ET]
Table 'Abetti IV' 2-max Seat #1 is the button
Seat 1: Mastermixus ($57.69 in chips)
Seat 2: YouDisgustMe ($55.04 in chips)
Mastermixus: posts small blind $0.25
YouDisgustMe: posts big blind $0.50
*** HOLE CARDS ***
Dealt to YouDisgustMe [Tc 8s]
Mastermixus: raises $1 to $1.50
YouDisgustMe: calls $1
*** FLOP *** [Th 4s 7d]
YouDisgustMe: checks
Mastermixus: bets $2
YouDisgustMe: calls $2
*** TURN *** [Th 4s 7d] [Kc]
YouDisgustMe: checks
Mastermixus: bets $4.50
YouDisgustMe: calls $4.50
*** RIVER *** [Th 4s 7d Kc] [4d]
YouDisgustMe: checks
Mastermixus: bets $18.50
YouDisgustMe: calls $18.50
*** SHOW DOWN ***
Mastermixus: shows [9c Qc] (a pair of Fours)
YouDisgustMe: shows [Tc 8s] (two pair, Tens and Fours)
YouDisgustMe collected $52.50 from pot
*** SUMMARY ***
Total pot $53 | Rake $0.50
Board [Th 4s 7d Kc 4d]
Seat 1: Mastermixus (button) (small blind) showed [9c Qc] and lost with a pair of Fours
Seat 2: YouDisgustMe (big blind) showed [Tc 8s] and won ($52.50) with two pair, Tens and Fours

probably a fold preflop

postflop looks good

Pre is fine for me. Nh!

Fold pre, postflop looks decent but I think his value range contains way more than just KK.

Okayish call pre for semi-knowledgeable hero.

That nl50 player obviously doesn't valuebet AT+ like this, but why do you think he can't do this lighter then FH, bluff missed and can't turn hands into bluff??? It's a snap at this limit (because of how unbalanced they are), unless villain was passive enough, straight forward, nit, or you had some special heart vibe or a read.