It tells the story of Mango Zai, a student majoring in Earth Studies at Mango University on Mango Planet, who suddenly gets the idea to submit a research report on Earthling professions for his graduation thesis. To gather firsthand information, Mango Zai believes he must personally experience the work and life of various Earthling professions. Filled with passion and curiosity, he arrives on Earth and becomes an intern across all walks of life, immersing himself in the diverse careers of Earthlings. Upon his initial arrival, the naive and clueless Mango Zai faces hilarious setbacks in every industry, yet he approaches his professional experiences with wildly creative methods, leading to a series of uproarious stories.