So you're saying that the true puppetmaster has no say here?

[ There's a bit of a scoff, and he shrugs without a care in the world. ]

After all, for all your amusement, for all your fun, in the end you're just pieces in someone else's game. You said that this is a dream, but choosing the wrong person can keep one perpetually trapped in that "dream". Even if they are thought to believe that they escaped it.

As for your question, there are only a few options it could be. A soul, or a heart.