I Raised a Turtle, How Did I Become a Supreme Immortal?

Chen Yu, facing terminal cancer and his girlfriend's betrayal, buys a small turtle and a viewing tank, only to accidentally travel to a cultivation world where he manifests a massive 'Great Luo Golden Immortal' avatar. Using his wit, he impersonates the Immortal Venerable to rescue and subdue his female disciple Shen Qingyao, obtaining treasures through a 'Heavenly Dao Contract' that cures his cancer and brings him immense wealth. In the real world, he punishes his ex-girlfriend and a wealthy young man, accumulating vast riches with medicinal pills; in the cultivation realm, he navigates dangers posed by powerful enemies like ancient beast ancestors, relying on his spiritual pet Xuanwu and cunning to survive. Finally, Shen Qingyao travels to the real world to reunite with him, and the two confess their feelings to each other.