I Contracted an Apocalypse Dragon from the Start

(Transmigration (body transmigration) + lord + developing a domain + Western fantasy + farming + multiple races + dragons)

A pure-hearted engineering student was on his way to his first date with a girl when someone who jumped from a building landed on him and killed him. By a stroke of luck, he transmigrated to a fantasy world reminiscent of the Middle Ages. This world was home to beautiful elves, dwarves skilled in smithing, goblins gifted at creation, strong and ferocious orcs, and more. He passed himself off as the deceased son of a nobleman, but after his brothers framed him, he was sent to a remote, inhospitable territory. There, he unexpectedly formed a symbiotic pact with an “evil” dragon that had once nearly destroyed the world. He grew potatoes and sweet potatoes, made bricks and cement, built toilets, bought werewolf slaves, and hired dwarf masters to forge weapons, transforming his domain into a thriving territory. Along the way, he also met many lovely confidantes: a wise human mage, a female paladin who firmly believed in justice, and a proud but kind-hearted elf archer. But as his power grew, many truths slowly came to light...