Riding a Donkey to Save All Worlds

After an unexpected disaster, an unreliable female boss, and an appointment letter printed on a single sheet of A4 paper, Zhang Wuyue somehow became a divine envoy. A divine envoy with a monthly salary and bonuses, official proof of employment, and the duty to save the world at a moment's notice. I'm just an ordinary citizen! Could you please not spring something this intense on me all of a sudden?