I Deliver Express in the World of Cultivating Immortals

The male protagonist was originally an ordinary courier in the world, but he was accidentally transported to the fairy world and received a system. During the dialogue with this system, he learned that his mission was to deliver express to everyone in the fairy world. Every time he completed a task, he would receive random rewards and face various difficulties. Do you think he can be domineering in the fairy world or just be an ordinary courier?