Disease Control Master

300 Years ago, a brutal war broke out between the animal and plant kingdoms headed by humans and mutated microorganisms. The war lasted for decades. Later generations called that era the Dark Ages. During that war, a mysterious international guild was born that specialized in destroying and controlling mutated microorganisms. The members were called disease control masters. Their endurance, speed, and strength were all superhuman, so they could easily control and hunt animals and plants that became infected and went berserk! What's more important is that they possess a magical ability called Qi energy. With this power, they maintain the current balance of the world. 300 Years later, some mysterious dark forces are ready to move again. The protagonist accidentally gets involved while investigating his own life experience. There seem to be many hidden secrets in the 300-year history that have not been solved. All of this gradually comes to light as the protagonist and his friends get deeper and deeper.