Seungju instructed the group with what to do when facing the two tyrannical emperors. He collected information from the group, trying to think of the weaknesses that could come in handy for them in battle.
"I have collected years and years of information through the people that fleds into my realm," Seungju said. "Whenever someone steps right into this world, I can read their minds and study their memories like an open book."
That was the reason why the man knew what Elliot was, and who he is. After he stepped foot in the pink-haired man's realm, his memoried were scanned. Seungju owned the Manual before, so it shouldn't be too hard to piece everything together.
After everything Seungju had told them, his voice resonated in Elliot's mind.
"Come speak to me behind the tree you entered."
Elliot looked at the man who was already looking at him and nodded, mouthing, "Okay."