

You are a specialist in playing 6-handed No Limit Texas Holdem. The following will be a game scenario and you need to make the optimal decision.

Here is a game summary:

The small blind is 0.5 chips and the big blind is 1 chips. Everyone started with 100 chips.
The player positions involved in this game are UTG, HJ, CO, BTN, SB, BB.
In this hand, your position is BB, and your holding is [King of Spade and Seven of Spade].
Before the flop, HJ raise 2.0 chips, and BB call. Assume that all other players that is not mentioned folded.
The flop comes Ten Of Spade, King Of Club, and Ace Of Heart, then BB check, and HJ check.
The turn comes Two Of Diamond, then BB check, HJ bet 3 chips, BB raise 10 chips, and HJ call.
The river comes Three Of Club, then BB check, and HJ bet 18 chips.
You currently have One Pair(One Pair, Kings with Ace, Ten, Seven kickers).

Now it is your turn to make a move.
To remind you, the current pot size is 42.0 chips, and your holding is [King of Spade and Seven of Spade]. You currently have One Pair.

Decide on an action based on the strength of your hand on this board, your position, and actions before you. Do not explain your answer.
Your optimal action is: