Emperor Qin Returns! I Am The Eternal Immortal Emperor summary:

Emperor Qin Ying Zheng was unable to overcome the tribulations in the immortal world. He was reborn in the city, where the spiritual force was restored. With his sword, he vanquished the strong men from outside the realm, conquered the ladies in the harem, and called forth the fierce warriors and fierce generals with his hands to conquer the entire world! He held the title of Emperor of the Immortals during his previous existence. He pledged to return to the immortal realm and reach the pinnacle of immortality in this life!