The Extra's Return TER

[You have been killed by the Hero of Light.]

[You have died.]

I had died at the hands of the main character in the novel I had read before.

But I got another chance. I regressed and returned to the time when I first entered this novel world.

Once again, I live in this novel world as an extra character.

Since I have experience and knowledge, especially my World System which had upgraded, I'll do what I want to do.

I will become stronger than the main character.
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POV 1 : √
Harem: √
Toxic Friends: X Big No.
Naive Protagonist: X
Pervert Protagonist: X
Toxic Harem: X
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English is not my first language, so, feel free to comment if any grammatical errors.

This is my discord: Munruel#6488

https://discord.gg/2MzrfZGD
And this is the channel of this book.