He didn't know. He never knew at all, did he? The reason his confession about Chara not being the greatest person shook them both to their core; because it wasn't just Frisk he was confessing it to. Because he never saw the asterisk in their head, the voice that offered them guidance, advice, the person that walked beside them, hand in hand.

"We were together," they admit, quietly. "From the start. We went through the Underground...together."

Not everyone knows that, at first.

Not even Frisk did.