[This is the 66th floor, gate of the ‘End of the Century City’.]

‘Is this right?’ Yeon-woo raised his collar and protected his mouth from the sudden, desolate wind. ‘This doesn’t look like a good place to meet and plan something.’ Although he had already visited the floor’s stage before, Yeon-woo hadn’t paid too much attention since his main objective had been to quickly clear the stage. Thanks to his younger brother’s diary, Yeon-woo knew the characteristics of each floor, and from what he remembered, the sixty-sixth floor was a stage without any special features.

A city that was at the end of a century—as its name suggested, it was gloomy and apocalyptic. Collapsed skyscrapers covered in vines contributed to the eerie atmosphere. The asphalt road was ruined and vegetation grew among its cracks. Yeon-woo could see vehicles haphazardly strewn all over the area. Deflated rubber tires and rubbish were piled up near a rusted traffic sign. There was a dark, underground passage, most likely once a subway station entrance, and occasionally, a rat or a mole would pop out.

‘Maybe that’s the theme is the remnants of a civilization completely destroyed by nuclear war…?’ The setting was familiar since Yeon-woo often watched apocalyptic movies, such as zombie movies, back on Earth. Actually, Yeon-woo didn’t even have to compare it to the movie. The scene...