Ling Cage: From the Start, I Found Iron Man's Core on the Surface

[Iron Man + Feel-Good Fiction + Keeping the Original Couples Together + Jingnan and Yue Kui] Lu Bei, a college student and veteran who stayed up late watching anime, unexpectedly transmigrates into the wasteland of Ling Cage. The good news: he's not only a Hunter, but also the adopted son of Morgan, the Lord of Lighthouse City. The bad news: on his first mission to the surface with Mark, their team is attacked by a huge swarm of Eaters. Injured, he gets separated from the others. At this critical moment, Lu Bei finds a glowing, round Ark reactor and activates the artificial intelligence built into it. [Good afternoon, Sir. Your butler, J.A.R.V.I.S., is at your service...] “So, as long as I kill enough Eaters, I can get everything from Mark II to Mark LXXXV, and even the Godslayer and the Celestials?” [Yes, Sir! Here is your first-meeting gift: an improved Extremis virus serum!] And so, Lu Bei begins his path of slaughter. Before long, the whole world has changed. Mark: “Honestly, it was an honor to have Lu Bei as one of my Hunters.” Morgan: “My boy, if you want it, the position of Lord of Lighthouse City is yours!” The Lightkeeper: “M-Mr. Lu, ohohoho! Could you reconsider? I've already swallowed it...” Charles: “This was all arranged by the Lord of Light and Shadow!” Bai Yuekui: “Mr. Lu, do you want a wife? Our ground-dwelling Awakeners need your strength. We'll offer twice what Lighthouse City does!” Jingnan: “Looks like I'm not the only one who likes Lu Bei.” Years later. Mana: “How can there be a devil who kills Eaters faster than the ecosystem can produce them? Stay away from me!”