Help! All My Clients Are Ghosts! What Do I Do?

[Mildly Spooky, Lighthearted, Not a Conventional Brain-Dead Wish-Fulfillment Story, Multiple Heroines]

Working customer service, but all the customers are ghosts?!

College student Lin Yu is forcibly bound to the [Grim Reaper Complaint Hotline] by a strange phone. Fail, and he dies!

To stay alive, he has no choice but to grit his teeth and deal with all kinds of bizarre underworld problems, and maybe… recruit a ghost?