Lin Shiyu unexpectedly became a food delivery rider at a low point in his life, and met a group of "weirdos in ordinary clothes" friends. They were born in big cities, carry their own dreams, and drift between survival and ideals. Wrong takeaways, weird rentals, pitfalls in the workplace, and hilarious parental cheating are endless. They seemed to have failed many times, but in the end they "swam upstream", using wisdom and unity to resolve life crises, and achieve their own growth and friendship. They gradually pried open the cold shell of the city, and surprises continued to emerge. The whole book uses humorous life anecdotes as clues to connect three volumes of ups and downs of urban struggle and life variations.