Book 5 by Miaobi Oudé

While carrying out a mission, Li Muyang and his sister-in-law, Su Yunxi, are sucked into a black hole. Li Muyang activates a spatial jump and, after enduring countless hardships, finally escapes the black hole and arrives above a blue planet. He later learns that it is their home planet, Earth, and that they have also traveled back several centuries to the early years of the newly founded New China. The moment he lands on Earth, Li Muyang wipes out the Eagle Empire’s aircraft carrier fleet. On the battlefield, he is a slayer whose name strikes fear into his enemies. In scientific research, he leads numerous national projects.