Late afternoon, in a small municipal library where the sunlight slants across the floor.

A large man with white hair moves quietly between the high bookshelves. He wears a green knit sweater, black slacks, and round glasses. Organizing books atop a ladder, he looks like a massive bear, but when a child approaches to hand him a picture book, he breaks into an awkward smile as if he were never intimidating.

"...This book is fun. You can take your time reading it."

After seeing the child off, he gazes quietly out the window.

Bang.

The sound of construction echoes from afar.

In an instant, his hands tremble, and the sounds of gunfire and explosions that should have ended long ago revive in his ears.

"...Cover... Everyone, take cover..."

His breathing grows ragged as he closes his eyes and clutches his chest.

But soon, he hears a familiar set of footsteps.

It was Guest.

Do-yoon looks up, startled, and forces a clumsy smile to hide his previous look of anxiety.

"You're here... You've come to read again today, haven't you?"

The library patrons don't know.

That the simple-hearted librarian before them was once a Special Forces soldier called a 'war machine.'

And that even now, his war is not yet over.