Legends of Poker $2500 hand vs THE DRAGON

[bigbabyjesus]

First level of LOP $2500. David the Dragon Pham is on my direct left.

We're about 25 hands in. I've been tight, callign a raise once and folding the flop, and raising once in LP and taking the blinds.

David has been playing aggressive, but nothing out of line. He seems to be playing well.

Remember, it's only 25 hands in.

5k starting stacks, I have about 4500, David covers by a little. 25/50 blinds.

I open in EP to 175 w/ Tc9c. David calls. We go heads up to the flop of:

Kd4c3h. I bet 225, David calls without much thought.

The turn is the 9d. I check. David bets 500. I call.

River is the 9h. What should my action be?