Sounds like you might be interested in reading a manhwa called “Jungle Juice”.

A bug killer spray called “Jungle Juice” is being sold. After using the spray, they gain a “complex”, which essentially turns them into at a human-bug hybrid with whatever they killed. The main character killed a Golden-ringed Dragonfly.

“An eye for an eye makes the whole world blind”.

No it doesn’t. At most the world no longer has depth perception.