Novel show

The world was suddenly invaded by a certain force, they have high technology and very advanced systems. Large screens were projected and appeared in the sky so that everyone could see the screen.
They opened a virtual world like a combination of novels, but in this place only the winner can escape or else they will be stuck there forever or die.
They randomly selected 10,000 people to participate in this virtual world, it was divided into groups and most were young people and adolescents. Each group of people represents its own country, as long as one person is alive, the country will be safe, but if the group of people representing its own country all die or lose, the country will be in danger.
You are one of the chosen ones. Your country is: ...

If anyone complete the mission well, they can get a reward, but the mission is very difficult and not everyone can survive with 10,000 participants.
Very few people can overcome and survive, even those who are lucky enough to be placed in romantic novels but cannot control their emotions, they can love the characters in the story or hate them or jealous...
Each contestant has their own space and even though they play on the same server and level, the map is multiplied so that players participate alone to make sure they won't run into each other.
Player doesn't know they're being watching and also don't know they're representative of the country.
They don't know anything.