Direction

So, the front side should lead to the outer palace. And opposite to that, the west should be the backside.

"Now remains north and south"

Right would be the south, the remaining area of the palace. And left is north, in the direction of the throne room.

"Let's go to the left"

[Why do you feel that way?]

"I noticed that the underground palace reminds me of some books I have read about my ancestors" 

[Let's go then]

As I continued to walk...ran north, I found the pathway awfully familiar. Someone who has spent his entire childhood here in the palace can easily walk through this underground palace.

In the book of my ancestors, there was mention of many things such as how they conquered kingdoms by doing stupid things.

That is one of the things which I admire about my ancestors.

[It's amazing that you can see everything clearly, even though it's pitch dark]

"It is because of my system, right?"