Future Military Doctor

While studying a demon dragon that massacred millions of people on the Earth Federation's colonial planet, the demon dragon used a secret method to self-destruct. The chief medical officer of the Earth Federation returned to modern times and became a second-generation ancestor whose body was so weak that he could faint at any time. Back in modern times, with his unparalleled medical skills, he was improving his body and rebuilding his ninth-level physique. However, time is getting increasingly tight, and there are strong martial arts masters, even cultivators, and the invasion of alien civilizations... Let's see how our chief medical officer copes with all this and embarks on a path to break through his own limits.