Just got a table change, no info other than hero probably has a winning image as I showed up to the game with $800ish. Straddle on. 4 limps to hero in bb who completes with Kh10s. Straddle knuckles.

Flop Ad Kd Kc. Hero leads 30, straddle folds, original limper min raises to 60. I would guess he's around 25, white and started the hand with around $400.

Folds back to me, I call. Turn 2s. I x, guy bets 80. I call again expecting him to shut down with anything I beat on the river.

River 4s. I x, he bets 100, I fold.

If you believe he could have a weaker king, then you should be bet/folding on the turn and river, not check/calling

If you believe he it's highly unlikely that he would limp in with K9 or worse, then you should have folded to the flop raise.

huh. No reads makes this tough.
You beat AQ, AJ, AT. You lose to AA, AK, KQ, KJ.
You played it well as did V. Once you call 80 on turn, he fully expects to get value when he bets 100 on river.
Without reads, I'm calling 100 on the river, esp after calling 80 on turn, but I don't see V playing QQ this way, and it's unlikely he opened with K9 or worse so I think this is a pretty good fold. Maybe you can fold turn. Absent further info, I don't think folding turn is generally a winning play. Calling the flop raise seems mandatory.
One thing: players do not expect you to open with a K in this spot so your hand may be under repped. But when he raises flop, bets turn, bets river, his hand typically beats yours. If KJ and KQ weren't part of his range, obvi, you snap call. But as played, this seems like a very good fold.