Send Yourself to the World of Immortality

[Anti-system + Sci-fi + No heroine + Behind the scenes] Zhang Xuan was dragged by his future self and sent to a world of immortality by his hair. "So... What am I doing here?" "Whatever!" "No, if you catch me here, at least give me a system, right?" "System? No, but there are many things in this world that you want, go and catch them yourself!" … When the ultimate technology collides with the ancient gods, when the overflowing system and the chaotic practice system conflict, the deserters are afraid of the lords, and the destroyers hate the destroyed... Please, I am just a traveler trapped in this world. I will leave after completing the transaction with others, so... Please die!