Notes from a Lonely City

The sun was attacked by alien civilization and entered irreversible decay, periodically releasing alpha rays to the earth. This ray caused a sharp decline in the world's population. In order to preserve the fire of human civilization, governments around the world have organized "underground city" projects, and a large number of people have moved underground. During this period, delta rays, which need to be excited by balanced radiation instruments, can deflect alpha rays. Earthly civilization relies on this type of radiation to enter a period of endless war. Lin Huai, an actuary who can operate this instrument, was ordered by the army to come to the ground. While performing a top-secret mission, he accidentally discovered the conspiracy of a few elements in the "underground city" to restart human civilization.