Lin Xiaoman, a 20-year-old delivery boy, wears a dragon-patterned bronze ring left behind by his parents before they disappeared. He makes a living in the city streets and warms the people around him with his poor words and kindness. When the road collapsed during a heavy rain, he accidentally activated the power of the dragon soul in the ring, single-handedly rescued the trapped old man, and also revealed the fantasy world hidden in the modern city.
Retired special police officer Lao Zhou's car repair shop hides the secrets of the world. His childhood sweetheart and ancient book restorer Su Qingyu holds the secret records of Xuanmen. The three of them formed a team due to the pursuit of the mysterious organization "Dark Abyss". From the mechanical monsters in the abandoned factory, to the space-time talisman array in the Science and Technology Museum, to the spiritual guardians of the ancient trees in the old city, Lin Xiaoman concealed his identity and continued to deliver food, while unlocking the dragon soul energy in the bloody battle and performing strange tricks with the transformed take-out box.
The leader of "Dark Abyss", Ye Xiao, transformed into a technology tycoon and plotted to release the ancient evil god with the secret treasure of Xuanmen. His conspiracy was actually closely related to the disappearance of Lin Xiaoman's parents. When the skyscraper's seal undoing ritual started, Lao Zhou sacrificed himself to practice the way of guardianship. Lin Xiaoman broke through the limit in grief, fused the power of the dragon soul with urban electricity, and transformed into the "Urban Thunder Dragon" to end evil.
The story is intertwined with bloody battles and warm bonds, with both the fireworks of modern cities and the heroic passion of fantasy rivers and lakes. Lin Xiaoman has grown from an ordinary young man searching for his parents' whereabouts to a hero guarding the city. His sleeping parents and his unfinished journey to find the medicine are still waiting for him to continue writing a new legend.
