tricky hand with 77's....advice please

[tiger7210]

late in a $10 MTT on Stars with about 25 left. BB 2000.
my stack size 38000 villain in hand has 29000 in SB.

i open in MP for 6000.
villain calls from SB for 5000.

pot~15000 flop K4K rainbow.

villain makes weak lead out for 6000.

My read on villain is somewhat loose aggressive but not reckless. He recently lost a big stack and then rebuilt to where he is now.

I have 29000 and there is now 21000 in the pot.

What's my line here?