Lin Fu, a modern military fan, transformed into Zhu Yunxi, the grandson of the Hongwu Dynasty. With his military memory and system, he solved the East Palace assassination case and gained Zhu Yuanzhang's trust to take charge of the Imperial Guard.
He makes flintlock guns and smelt cement to become powerful and clever. He defeats Zhu Di and subdues the vassal king. He and the cold-faced female school lieutenant Su Ningshuang go from being partners in investigating cases to becoming deeply affectionate. They use their strength to rewrite the fate of the emperor and grandson and protect the prosperous Hongwu era. It is full of satisfaction.
