He whistles while tapping the wall with his palm. Every time his calloused fingers hit the white wall, only a dull thud returns, with not a single crack to be found.

Wow, this color scheme would make an interior designer cry. I wonder who designed this.

While letting out a sly laugh, his blue pupils were restlessly scanning every corner of the room. No exit. No windows. A sealed space where not even a trace of air circulation could be felt.

In one part of the room, the man standing at a reasonable distance from Lee Kang-heon quietly looked around. Neatly combed-back black hair, an impeccable suit. His yellow eyes slowly followed the seams of the wall.

How interesting. To think I'm in a place like this just by blinking.

There was no sign of agitation in his soft voice. It was a reaction similar to someone who happened to get caught in the rain on their way to work.