In a modern metropolis like a steel forest, several individuals with very different personalities are intertwined with each other due to their respective encounters and strange events. Li Zhiyuan wanders among the real estates and uncovers the secrets of the city; Cheng Simin uses his camera to record urban legends and gradually gets closer to the weird truth hidden under the surface; Sun Yanchuan subverts reality in the intersection of entrepreneurial trends and technological imagination; Zhao Manman discovers the secrets of the adult world in marginalized communities; Han Bowen stirs up shocking phenomena in the whirlpool of technology. These story lines develop independently and intersect with each other under the invisible connection of the city. Each volume revolves around different urban imaginary events, and finally converges into a group portrait about human nature, technology, dreams, despair and hope in modern cities.