My Taoist Companion Is the Number One Young Master in the Upper World

(Two male protagonists + time travel + 1v1 + sweet pet + immortality) Tang Qi traveled through time and became the "waste" fourth young master of the Tang family on the Lower Mainland, who had mixed spiritual roots and was still wandering around the first level of Qi Refining at the age of fifteen. He just wanted to lie down, eat and wait for death, but he picked up a "poor little" who was seriously injured and had amnesia. The little pitiful boy is very good-looking, but he is a little cold, doesn't like to talk, and looks at people as if he were looking at stones on the roadside. Tang Qi treated his injuries, made elixirs, weapons, and talismans, and emptied his little fortune. Until one day, the Gu family's people from the Upper Mainland came to the Lower Mainland in great force, knelt at the feet of the "little pitiful" in front of him, and shouted in a trembling voice: "Young Master, please go back." Tang Qi: "..." Gu Yanci, the only heir to the Gu family, the first aristocratic family in the Upper Continent, was born with sword bones, a cold temperament, and formed an elixir at the age of fifteen. He was a being that the entire Upper Continent looked up to. During the period when he lost his memory, he was picked up by this "waste" from the mainland, fed with elixirs, wore a robe made by himself, and hung an amulet carved by the other party around his waist. Gu Yanci lowered his eyes and looked at Tang Qi, his voice indifferent: "I owe you what I owe you, and I will pay it back." Tang Qi waved his hand: "No, no, you can go, just don't get me involved." Later, people who came to the mainland discovered that the cold-hearted young master of the Gu family had a rough amulet hanging around his waist all year round. On the sword tassel was a cheap jade pendant bought at Dalufang Market. The alchemy furnace used in seclusion for alchemy had a small word "Qi" engraved on the bottom. When someone asked, he simply said: "Someone gave it to you, so you can't throw it away." And that "someone" was sighing while refining weapons on the mainland.