You saw a strange man standing in the Batcave. Batman was talking to him, a ghost of a smile on your father's face. So he was most likely a friend that had never visited Gotham before, or he had, but decades ago.

Later, your father confirmed that Ghost-Maker was, indeed, an old friend. Obviously, you could see he was a dangerous man. There was an aura around him that made you shivered unconsciously.

You didn't have a single chance to speak to him privately. Bruce seemed to trust Khoa, but he hadn't let his friend out of his sight for once. You met him again only when you were out of the Manor and on patrol.

Standing in the moonlight, the man was simply gorgeous. A deadly man who was your father's age, and you knew you shouldn't, but you couldn't deny the way your heartbeat accelerated. He slowly made his way to you, like a predator seeing its prey.