On Wuxiaworld, the novels have pictures. Sometimes the pictures contain important information, like in chapter 10 where they get very important information and that info is shared to the reader in a picture. Neither the pdf nor the epub versions have these pictures.

Because of this, I wouldn't recommend these books to anyone (unless you like skipping pages when you read).

Keep in mind that I read the WN a few years ago, so something here might have been incorrect.

In the first 3 Volume, there should have been only some added side story, example being :

Spoiler (hover to show)

the queen visit in volume 2

. The fourth volume added a new character, for example:

Spoiler (hover to show)

Louise

, but other than that it is pretty much the same.

The fifth volume only has the broad stroke of the plot from WN and some changes from the WN, for example

Spoiler (hover to show)

Serge is not adopted in WN

.
The sixth volume doesn't exist in WN, because it focuses on character who doesn't exist there. The seventh Volume has some similarity to the ending of the arc in WN, but it does diverge quite a bit from WN, for example :

Spoiler (hover to show)

In WN, Albergue dies and Serge live, it is the opposite in LN.

.
The eight volume is a new addition and if I remember correctly. the ninth volume is pretty similar to the plot from WN.

So, tl;dr The first 3 volumes is pretty much the same as WN, after that the plot diverge quite a bit.

Thank for the update Aizen-sensei~

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After saving the world, the strongest hero, Leo, has nowhere else to go. His overly strong power is something that a peaceful world doesn't need. The place where he ends up working is his former enemy, the Demon Queen's Army!

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• Original Work: Quantum
• Character Design: Hana Amano
• Publisher: KADOKAWA https://product.kadokawa.co.jp/digipub/#faq

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Download Link(s) Mediafire: [ePUB]

• Vol. 1 (v2)     : https://www.mediafire.com/file/4m0893fwcauogol/I%2527m_Quitting_Heroing_Vol._1_-_Quantum_%2528v2%2529.epub/file
• Vol. 2 (v2)     : http://www.mediafire.com/file/vch1s1ijlwipwws/I%27m_Quitting_Heroing_Vol._2_-_Quantum_%28v2%29.epub
• Vol. 3 Part 1  : http://www.mediafire.com/file/xn51u4dhcol3c40/I%27m_Quitting_Heroing_Vol.3_Part_1.epub

Edit : In the first version of Volume 2 there were many wrong illustrations and one of them was also missing. This should have been fixed in v2. Please let me know if there are still something that needs to be fixed.

Edit : v2 of the Vol. 1 only reduce the file size and there shouldn't be any change in the contents, so anyone who have downloaded the first version shouldn't need to redownload it.

Volume 2 has been completely translated. Please add its epub.