Ghost doesn't have a soulmate. So when people ask – of course they do. After all, who wouldn't want to know his ( ❝ You got a mark? ❞ ). He answers accordingly – an abrasive comment that he's repeated so many times over the years, it comes out easily, indifferently, but is disheartening to hear for anybody who makes the mistake of trying to pry the information out of him.
Every inch of his body's been catalogued, he says; no black-and-white evidence of a symbol or a word anywhere that's tying him to a specific person. And why would he want that? To be cosmically bound to someone he's never even met? It's bullshit: only feeds the idea of a clockwork universe where free will is an illusion.
You don't bring up then, how your mark matches the one he keeps hidden somewhere in the tattoo sleeve on his left arm.