Step 1: The Path Forwards.
Because the only clue he got about the myth is 'a giant tree', he referred to the only thing he knows---the tree bridge he used some time earlier to reach the Shoulder Guards.
-the item in question is still in silversmith workshop; after he tested it for some questions, he managed to get at least hints of his past:
-He is not related to royalty
-He is lower-caste citizen
-He has no families as now
-His family has been dead for some time now
And the last but not least important-
-Q: Why are the Horseman attacking the Castle? Is there's someone behind it?
The Sapphire glows. That's a yes.
-Q: Then, is the Great King safe?
...
No stone glows.
That ambiguous answer sparked more curiosity, but as he asked more question, the stones breaks off the armor piece. It seems he had overdid it.
As he climbed the tree once again, he continued to ponder---
-and he crashed into a beehive. More precisely, broke open into it. Getting slathered by honey is one thing, but the stings! OH GOD THE STINGS!
He should find a face mask. Really, nobody wants to see his face right now.
QUEST STATUS
Food remaining: 21/21
YOUR HP: 30/30