“They aren’t a specific species. They can range from Twin-Armed Monkeys to even rare species from the 6th Floor. The only thing differentiating them from ordinary creatures is the strange mark they have on their bodies,” Lee Jun-Young explained.

“By a strange mark, you mean...” Kim Jin-Woo began.

“They have something like a tattoo on them, in the shape of a half-opened eye. And the creatures that bear this mark are what we call ‘Sentinels’.” Lee Jun-Young went on to explain how these Sentinel beings had brought death and destruction upon the human army in the previous war, before concluding, “It seems the institute isn’t going to let this matter rest this time. The moment the Sentinels made their appearance, peace was no longer an option.”

“But come to think of it, weren’t the humans the one to break the armistice first? Isn’t a massive invasion into the Underworld an act of aggression in itself?” Kim Jin-Woo suddenly noticed that he was rebuking the humans, and quickly stopped himself from saying anything further.

But thankfully, Lee Jun-Young didn’t seem to notice anything. She replied, “That may be true, but the government is worried that the Sentinels may rise up to the surface just like before. People are still speaking as though another...