This is an urban realistic novel full of "original" fireworks atmosphere. It does not avoid the harshness of history (market chaos, power rent-seeking, violent law enforcement, and the struggles of marginalized people), nor does it whitewash the insignificance and helplessness of individuals under the great wheel of the times. The Xi'an in the book is filled with the aroma of cumin meat and the rotten smell of the sewers. It is filled with the songs of Teresa Teng and the roar of Qin opera. It is printed with the slogan "Development is the last word" and the word "demolition". The mottled rust and fresh paint on the iron gates silently tell the story of the city's healing scars and new muscles in the process of change. When the three unexpectedly reunited in 2013 at the root of the ancient city wall that had not yet been demolished, each carrying the dust of the times and the current predicament, could they re-anchor their own direction in the city's steel forest? Inside and outside the iron gate, is it the new life of the city or the lost nostalgia? In this land that has been plowed repeatedly by the times, there has never been a real winner.