Its Tuan.
I have to say, Im pretty surprised and impressed by Tuan's call, especially considering that he is a really LAG player. He must really gotten a decent read on Howard. He knows Howard isnt raising on the river with just a straight or just trip kings. I dont think he put Howard on JJ or QQ because of no PFR, but Howard did limp in. KQ, KJ is a possibility, though it would seem a bit unlikely, but not impossible since Tuan was holding a K and 2 were on the board. Tuan must've figured out that Howard is most only raising with a boat here. I think Tuan just called because Howard could be raising with KJ, KQ to beat him, but there is a chance at Howard raising with K9 or possibly 99.