He heard a voice.
The boy was speaking to him through the window.
Despite being separated by merely a layer of glass, the voice became incredibly vague, as if it came from a faraway place; it also resembled an old communication device experiencing signal interference, drowned out by a cacophony of background noise.
The doctor strained his ears to listen and finally caught a few words.
"...uncle... uncle... uncle..."
—The other party was calling out, wanting to communicate with him.
Once he realized this, the echoing clamor in his ears suddenly became exceptionally clear.
"Uncle, uncle, it's so good..."
That pale smile seemed like a mask firmly glued to the boy's face, the ghost outside the window staring unblinkingly at him.
"This time, you finally didn't run away."
The doctor knew he was in a dream, but he couldn't help swallowing nervously.
"Who... who are you?"
"My name is Ke Junchen, uncle knows this."
"What do you want?"
"I hope uncle can do me a favor."