Extremely hot apocalypse, with an outdoor temperature of 70°C. Everyone was huddled in the shelter waiting to die, and I was bound to the "Doomsday Errand System". Order 1: Send ten tons of liquid nitrogen to the Southern Military Region, reward: rank of major. Order 2: Help the richest man get the family trust from the bank vault, reward: half of the assets. Order 3: Take the academician of the Academy of Sciences to the northwest base, reward: sharing of controllable nuclear fusion technology. Later, when I was leisurely taking orders in an air-conditioned takeout truck at the end of the day, the voice of the commander-in-chief suddenly came from the car radio: "Comrade, can... Can you send a cup of iced Coke to the command center? We will exchange intercontinental missiles for you."