Gu Jingchuan has spent three years mining coal. When his biological father, Gu Yuanshan, arrives to negotiate an acquisition, the so-called "son" accompanying him, Zhao Wenbin, recognizes Jingchuan at a glance and hurriedly locks him back inside an old mine shaft. Jingchuan desperately calls for help, only to discover that his father has been searching for him all along, while Zhao Wenbin has stolen his identity and claimed his paternity test results. His ex-girlfriend, Fang Yutong, delivers a forged letter claiming that his father wants nothing to do with him and even plans to transfer him to another mine. When Gu Yuanshan discovers that the miners are being hidden, he halts the deal and rescues his son. After father and son reunite, unpaid miners' wages, a 30-million-yuan advance payment, and the key to the old mine shaft gradually uncover a series of old crimes. The impostor young master and the mastermind behind him turn against each other, while Jingchuan and his father fight to win justice for the workers.