Aren't you getting direct odds even against an ace? I don't think he has an ace 100% of the time either, so I think it is a call.

I think you should fold K10s UTG, if someone 3bet you, you wouldnt be able to call. Since you played the hand and got to the turn i think it was a call, bbs hands could be QJdd, 79dd,j10o q10o etc.

Yeah K10s as pretty as it is, that is the worst dynamic to pick that up. UTG with 20 ish bigs I think it's a fold pre. And now you're in the pot facing the turn jam, I think he's not got many aces in his range. 79, 9J look most likely here with a flush draw. I think you have to call the turn.