I Became a Parasite, Eating the Main Character

I became a parasite and my life cycle was only 7 days. I have the goal of evolution in my mind, which is to parasitize those martial arts geniuses. As long as I kill them, my evolutionary genes will increase and I will evolve. My intuition tells me that if I keep causing trouble, I may become human again, so I want to eat all the protagonists. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.