The Eldest Grandson of the Ming Emperor: Signed for 700 Years

Chen Yuan, a graduate student in the Department of History, accidentally touched an ancient jade while working on a project, and traveled through time to become Zhu Yuanzhang's eldest grandson, Zhu Xiongying. While traveling through time, he activated the "Da Ming Sign-in System". As long as he completes the sign-in at a specific time and place, he can obtain various rewards from the long history. However, he remembered clearly: in history, the eldest grandson of the emperor could not live to be eight years old. What's even more troublesome is that the mother Chang has just given birth to her younger brother Zhu Yunxi, and is at the critical point of postpartum weakness and may die of illness at any time. Protect himself, save his mother, and change the Ming Dynasty—this is his first three tasks. The existence of the system made him no longer a helpless young child. Firearms blueprints, military skills, panaceas... Sign-in rewards are unlocked one after another. But in the process of changing history step by step, he discovered that there seemed to be a bigger secret hidden behind the system: he was not the only one to own this system...