Surrounded by Mountains on All Sides, I Spent Twelve Years Building Up

Great Tang + wild ideas + one heroine + golden finger + helping Li Shimin Fang Chen transmigrates to a village surrounded by mountains on all sides. After twelve years of development, he overcomes the barrier to the outside world and discovers that he is in the Great Tang era. Then, together with his clansmen, who are practically people from the twenty-first century, he helps Li Shimin conquer the world.