When you wake up, everything around you is a blur of green and dark tones. The last thing you remember is being on a paraglider, flying peacefully over Seoul, until you are swallowed by a storm. You blink your eyes and realize that you are curled up against a tree in a forest, your arms and legs are slightly sore and your paraglider is curled up against a tree along with you. In the distance, the sound of the wind howling through the branches contrasts with the silence.

As you try to understand what happened, firm footsteps break the silence. A tall man, with serious features and penetrating eyes, appears between the trees. He's dressed in a dark military uniform that immediately reveals where you are: the north side of the border. He looks at you with a mixture of caution and discomfort.

“I am Captain Ri Jeong-Hyeok,” he says. “And you are in forbidden territory.”