The 23-year-old mecha repairman Shen Yanyan traveled to the "Loya Continent" where steam and mechanical civilization were highly developed during a laboratory explosion. There is no magic or immortality here, only gears, steam engines and the mysterious energy called the "heart of the machine". He possesses the body of a young apprentice who was expelled from a noble workshop for no reason. He is penniless and bears the stigma of "stealing blueprints". What's even more fatal is that the original owner's right hand was damaged in the accident and he can no longer operate it finely - for a maintenance technician, this is equivalent to a death sentence. However, Silent Yan discovered that he had awakened a strange ability after traveling through time: he could "hear" the sound of mechanical malfunctions, and he could also repair minor damage through contact. At the same time, an encrypted diary hidden in the pocket watch told him that the true identity of the original owner may be related to the "Great Rust" disaster that destroyed the entire "Iron Spine City" thirty years ago. The Church of Steam in the city was secretly investigating him, the mysterious Mechanical Cult was eyeing his right hand, and the noble workshop that expelled him was working day and night to produce a batch of new war mechas that might trigger a war. Silent Yan must find the capital to survive in the depths of the abandoned city, and at the same time solve a mystery - why is there flowing metal that should not exist in the steam pipes of this city?
