Double Penetration: Why Are the Three Rebels in the Demon Refining Pot?

[Traveling through the worlds of all parties + semi-invincible + non-system + urban development + wandering into other worlds + mythical system] A middle-aged man is unemployed and suffering from cancer, but he accidentally gets the magic pot of demon refining, travels to a different world, and begins a life of being a poor middle-aged man. What? There is also a nine-tailed fox in the demon refining pot, and it gave me a "divine mask" to protect me in another world? But how could this be self-protection? Even the ninth-level beasts were blown away. In the cyber world, a single nano-repair robot can cure most diseases, so you can't take one back with you. The currency of the world of the blue-scaled lizards is actually a kind of training resource. You are so poorly dressed, so I will exchange my training clothes for you.