Hogwarts: I'm Cousin Harry.

Become Harry's cousin, the original author's designated Muggle.
Brother Xun has a good saying: "Merlin closes a door for you and opens a window for you."
After getting a weird mage system... Merlin opened the skylight over Dudley's head... well, maybe Merlin lifted the roof off Dudley's house.
Dudley Dursley: "Listen, I'm not what you think, I'm a spellcaster!"
Under the moonlight, Dudley twisted his waist into a strange posture, and a BGM sounded behind him: "Okay, I have a showdown. I admit that wizards have limits, so I don't want to be a wizard anymore! Potter!"
"System, if you continue like this, I will learn 72 changes and become a Super Saiyan."
This book is also known as "The God of Physics", "Anything but Magic", "Actually I Can Magic", "I'm Really Not Harry Merlin".
There are three completed works with one million words and one completed work with two million words, which are guaranteed, please rest assured to collect them.