Signal light

Exploration Stage: Harvest Festival
From: Juliette
Description: I can't wait to find those missing people and get the hell away from this creepy place and celebrate. It's getting darker and darker. Oh, I see a light up ahead! It looks like a lantern light. The guide said, "Do you think it belongs to someone? Let's go and check it out.
Completed: The guides always carry lanterns like this. I wonder if he's around here? Unfortunately, I don't see anyone around. I took a closer look and found that this lantern is a little strange. There seems to be a glowing acorn in it. What's going on in this maze?