Fantasy: I Created a Virus

Is this a fantasy world? Am I a handyman with no background, no strength, and no talent? It doesn't matter. I have a virus-creating system, and all living beings, including those who cannot resist my virus, become nourishment for me to upgrade my strength. A wealthy family? Genius kid? Monsters and monsters? The most powerful person? Let's deal with my level 999 virus first. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.