Delivery boy Quan Mancheng accidentally traveled to the outer gate of the Immortal Realm while delivering food, and was bound to the bizarre "Mancheng Great God System". The system's task was not to make him practice hard, but to do all kinds of outrageous and outrageous operations: for example, he was asked to feed the spirit beasts with elixirs in takeout lunch boxes at the sect competition, and he was forced to snatch the sect leader's roasted sweet potatoes in the elixir furnace in front of the immortal. Relying on the "invincible buff" given by the system, Quan Mancheng was able to get super rewards every time he got into trouble. He transformed from a waste from the outer sect to an elite from the inner sect, beat away provocative demon cultivators, and stunned old-fashioned elders. Finally, during the battle between immortals and demons, he relied on the "Immortal Emperor-level take-out dining truck" purchased by the system to directly crush the army of demons. Naturally, he became the strongest immortal emperor in the world of immortality.