At midnight on January 1, 2333, a strange phenomenon occurred simultaneously around the world - a huge bloody countdown appeared in the sky, counting down to 100 days. Governments across the world are in panic, and all weapons are ineffective against the strange phenomenon. On the day when the countdown ended, a cold voice sounded in the minds of all humans:
"The weird game is officially started. Each country randomly selects a chosen one to represent the country and enter the weird dungeon. If the chosen person dies, the country will be re-drawn until there is no one left to draw. You can get rewards for completing the dungeon, and the rewards will benefit the chosen ones and all citizens. If you refuse to participate, the whole country will be wiped out."