Me! I Slacked Off from the Start and Forced the System to Upgrade

He lingers in the mortal world and roams freely between Heaven and Earth, living a life of boundless joy, surpassing even the Divine Kings.

PS:

This book is also known as: "Gods and Demons: The Water Margin Conquers Ten Thousand Worlds," "The Immortal Emperor's Scandalous History: It Begins with Taking Pan Jinlian as a Maid," and "The Heavens: Forging the Mightiest Great Song Dynasty."