He was originally a doctor with two degrees in chemical engineering and physics in the 21st century. After a laboratory explosion, his soul traveled through the world of cultivation and possessed a useless young man with low qualifications and severed meridians.
Others have practiced hard for thousands of years, but he uses science to break the path; others rely on mystical senses to make elixirs, but he does quantitative analysis and temperature control; others set up formations and teach formulas, but he uses geometric topology and energy field superposition to deduce - in his eyes, cultivating immortality is just a natural law that can be analyzed.