South Korea

 The capital is Seoul.

South and North share the DMZ, the Demilitarized zone, which is controlled by no less than 2 million people at one time. 

There are 4 known tunnels built under the DMZ including what South Korea dubbed the Third Tunnel of aggression, there are presumed to having around 20 more tunnels, but info on that is classified.

Everland (South Korea's biggest theme park) and Lotte world, the world's largest indoor theme park.

The population of 51 million people.

The South Korean Won is their currency.

Korean is their language. 

South Korea is a subscription-based country. As you must serve in the military between the ages of 18 and 35 for at least two years.

Also E-Sports.

Stress and suicide is common as *Honor culture* is in South Korea and society is pressuring.