The context of the following conversation is Kai hid a diamond beneath the surface of the pool and then lied about where it went.:
Kai says I have no idea where it went..
The friend responds I'm sure you do, because you are acting so weird..
Kai responds No I'm not..
The friend responds Yes you are, and you disappeared for awhile earlier..
Kai responds Okay, you can't tell anyone, but I hid it under the pool..
The friend responds Really? I promise I won't tell, but you have to split the earnings with me..