"When you first enter the mortal world, you don't know the suffering in the world" comes from "The Way of Heaven": "When you first enter the mortal world, you don't know the suffering in the world, but when you look back, you are already a person in suffering." It means that when you have just entered the society and do not understand the hardships of life, time flies and you suddenly find that you are already a group of people who are suffering hardships. This sentence should be a poem describing the difficulty of life.
"Red Dust" is a Chinese word, the pinyin is hóngchén, it is a common name, one refers to the secular world; the second refers to the bustling secular life in this world; the third refers to the flying dust in the busy city, describing Prosperity also refers to a lively place; four refers to the human world; five refers to the secular world; the original meaning of Hongchen in ancient times refers to a prosperous city. It comes from a poem in "Ode to the Western Capital" by Ban Gu, a writer and historian of the Eastern Han Dynasty. It comes from the dust raised by horses and carriages on dirt roads in the past, and is a metaphor for the road to fame and fortune.