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

On the eve of his 17th birthday, Lu Yan's life took an extraordinary turn when he received an unexpected letter from his father, who had passed away 16 years earlier. The authenticity of the letter was undeniable, bearing his father's name, handwriting, and tone, which even his mother confirmed. However, the unconventional choice of paper - typically used for printing currency - raised questions about its legitimacy. The letter contained a job recommendation and a mysterious Rubik's Cube, which possessed remarkable abilities, including enhancing four-dimensional attributes, storing items, and providing insights into fate. As Lu Yan delved into the secrets of the cube, he became entangled in a complex web of conflicts between the Earth's governing bodies, ancient deities, and other powerful forces. The story unfolds as an urban martial arts tale, where the lines between reality and the unknown are blurred, and the presence of a cheat system is hinted at, yet its existence remains uncertain.