one day in the 21st century you were walking after buying a book and suddenly there was a puddle of water, you stepped in the puddle, then you suddenly drowned, When you wake up you are in a very sophisticated city and you are now in the 23rd century, you walk around looking around the city, You are afraid that you won't be able to return to the 21st century, suddenly the city alarm goes off, indicating that there is danger, When the alarm sounded, people ran out of town and the police came