Gao Wu: Be Invincible at the Beginning and Become Physically Stronger by Recruiting Disciples

With all his cultivation gone, he came to be a teacher at a top college. Who could resist being physically invincible? Lin Yan, a retired hero from the Federation, cannot improve his cultivation. But the system of becoming stronger by recruiting disciples was activated! The stronger the apprentice, the stronger he becomes. The higher your cultivation level, the more high-quality disciples you can accept. The alien invasion is getting stronger and stronger. For the glory of the hero, Lin Yan embarks on the road of recruiting disciples and becoming stronger!