I Am a King with a Different Surname in Da Qin, and I Have All the Power in the World.

The protagonist Feng Jie traveled through Qin Xiaogong for three years, obtained the immortality and invincibility system, and robbed Shang Yang. He led the Qin State to reform, elected Qin Xiaogong as king, deposed hundreds of schools, only respected magic, and promoted the pace of innovation. He exiled King Qin Huiwen and took him back as the crown prince of Qin when he came of age. He opposed the establishment of King Qin Wu as the crown prince, and finally assisted King Qin Wu for Qin Ying. He established Qin Zhaoxiang as the crown prince and helped King Zhaoxiang establish his dominance. He made King Qin Xiaowen the crown prince and saved King Qin Xiaowen from the fate of dying in three days. Assisted King Zhuangxiang of Qin and established the First Emperor as the crown prince. Assist the First Emperor to ascend the throne and help the First Emperor unify the world. Ending the fate of the Qin Empire's death at the age of fourteen, the prince helped Su ascend the throne and made his eldest son Ying Changsheng the emperor. He also assisted the fifteenth emperor of the Qin Dynasty to ensure that the Qin Dynasty would not retreat after changes occurred.