The Delivery Boy Opens the Door to Another World on the 33Rd Floor

In order to save his terminally ill sister, a debt-ridden deliveryman was forced to take a "ghost order" to another world, only to find that he had become the last living courier in a time war between two civilizations. When one hour in reality is equal to thirty days in another world, would you choose to trade the rest of your life for your sister's ten-year lifespan, or destroy the truth that turns millions of riders into "time batteries"? What kind of story is happening on the non-existent 33rd floor! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.