A World Upside Down: Starting with a Letter from My Deceased Father

"Wait, you mean your father, who died 16 years ago, just sent you a letter? A dead man sending a letter to a living man? Are you sure it's not some kind of prank?" Lu Yan: "The name is right, the handwriting is right, my mom said the tone is right too. There's only one thing wrong," he pointed to the letter paper, "the paper. Nobody would write a letter on toilet paper used for printing paper money." On his 17th birthday, Lu Yan suddenly received a letter from his father, who had been dead for 16 years. Inside the letter was a job recommendation letter and a peculiar Rubik's Cube. The Rubik's Cube could enhance four-dimensional attributes, store items, and receive all sorts of fate information. The struggle and conflict between the Earth's home planet and the inverted world, the local government and the Deep Blue Council, various forces, and ancient gods gradually reveal the truth. There's a cheat system, but no system. It's an urban martial arts story, similar to Stranger Tales, with a suspenseful feel. Guaranteed 8,000 words per update after publication.