I Deliver Food to the Underworld

Jiang Chen, 24 years old, is a food delivery rider. His mother has terminal lung cancer and has a debt of 43,000. He is forced into a desperate situation by life. On a rainy night, there was an extra [underworld area] in his rider app. The first order: sent to the morgue. From then on, he became the only person in the city who delivered food to ghosts. Every time you send an order, merit will be credited to your account, which can be exchanged for money, life, and luck. But orders in the underworld cannot be refused or wrong. If you send the wrong order, you will be deducted not your money but your life. He delivered orders, counterattacked, and investigated the truth along the way, only to find that he was supposed to die in that river three years ago. Who stole him back to the earth? And why?