I Saw a Mage Wearing a Mecha?

What happens when two completely different worlds are connected? "You mean you just saw a man wearing a mecha with a staff in his hand, riding a dragon and passing by?" Mechas, mages, knights and reborn warriors? How could these things be in the same place at the same time? Of course it's because the magical continent Olivia and Blue Star are connected together by a huge portal for unknown reasons. What did the two go through from the initial hostility to the peaceful exchanges? It's probably nuclear peace and over-bit clearing. As a time traveler, Jiang Nan unexpectedly has a mysterious bloodline. He also has double buffs, but he just wants to be an ordinary person. It's a pity that God did not allow him to live up to his gift so much and imposed a lifespan limit on him. Maybe? "If it weren't for wanting to live a few more days, whoever wants to come to this miserable place would come!"