Doctor Double Traveled to Xuanwu Continent and Became the Great Emperor

Tang Hai, a doctor from the future world. While traveling through time and space, the data was tampered with by a colleague, and he traveled to a world of immortality. Possessed into a boy with the same name. Walk towards the path of cultivating immortality and become the son of destiny, Opening up a magnificent new era. (No system, farming, killing monsters and upgrading, purely cultivating immortals)