Inthefuture,humanshaveexhaustedallfossilfuelsandfullyrelyonsolarpower.Energycompaniesbegintofullycontrolthesun,andhumansocietymovestowardsSolarPowerIIcivilization.Butinanunexplainableastronomicalevent,thesunsuddenlydisappears.Introvertedastronomicalfree-lancewriterSunYangandhisuselessneighborChenMuareforcedtoteamuptogetherinordertoescapethiscatastrophe,andfindtherumoredlastsafehaven,DistrictFour.Ontheirway,theymeetnumerouspeople,andwitnessboththecrueltyofhumanityandfarewellswithwarmth.Aftercountlessencounterswithdeath,thetwolonelysoulsfinallygrowcloser,andbegintounderstandthemeaningoflifeduringadisaster...