The Immortal Who Pities the Gods

A little blind Daoist who barely managed to get into university gets entangled with a loafer from the Netherworld. Between protecting his self-destructive roommate and dealing with the loafer, his daily life is all heartache and exhaustion. After a trip to the Celestial Realm, the loafer changes yet again. What kind of past lives and present circumstances could have separated the two so completely?