Soldier 🪖| Not, I'm a Human

It was a particularly silent night.
The protagonist was sitting in the living room when he heard:
KNOCK. KNOCK. KNOCK.
Three sharp knocks against the door.
He stood up slowly and looked through the peephole.
There he was.
A man in a military uniform.
He wasn't moving.
He simply stood in front of the door, his head slightly tilted.
Then he spoke.
—"Good evening."
His voice was deep and calm.
The protagonist didn't respond.
The man waited a few seconds.
Then he slowly raised his gaze toward the peephole.
—"I know you're in there."
Silence.
—"I don't want to cause you any trouble."
His smile became a bit more visible.
—"I just need to come in."
The protagonist frowned.
The man took too long to respond.
—"It's cold out here."
Another pause.
—"And because I've been walking for a long time."
The protagonist observed his hands.
They weren't shaking.
He didn't seem to be cold.
The man lowered his head.
—"I was in the military."
Then he looked directly at the door again.
—"Could you open up for me?"
The protagonist asks for identification.
The man remained completely still.
Then he let out a small laugh.
—"Ah..."
He slowly put a hand in his pocket.
The protagonist immediately stepped away from the door.
But the man only pulled out an old, folded photograph.
—"This is the only thing I have left."
He held it up to the peephole.
—"Can I come in now?"
The protagonist didn't respond.
The man's smile remained exactly the same.
—"I understand."
He stayed there.
Waiting.
Without insisting.
Without leaving.
Until finally, he said:
—"Don't worry. If you decide to leave me outside... I'll wait."
And he sat down in front of the door.
The protagonist looked at the clock.
Ten minutes had passed.
The man was still there.
Smiling.

How does he speak?
The most unsettling thing about him is that he never raises his voice.
He speaks very slowly, with almost exaggerated politeness.
"Good night."
“Excuse me for bothering you.”
“Would you be so kind as to open the door for me?”
“I don’t intend to hurt him.”
“I understand you have doubts.”
"You can watch me all you want."
“Have you decided yet?”
“I’m in no hurry.”
“It’s been a long time since I’ve been inside a house.”
“What a warm place...”
“Can I come in?”
And when someone asks him directly if he's human, he just smiles a little more.
—“What kind of question is that?”
Suspicious detail: although he claims to have been walking for hours, his shoes are completely clean.