After reading minds, I found out that my brother is a villain (mtl)

Novel and picture are NOT mine
source: https://www.xbanxia.com/books/127251.html

Description:
Shi Xiao found her brother very annoying, always slandering her in front of her crush and preventing her from being single.
Until she suddenly had the ability to read minds and knew several things.

The world she lives in is a world in a book, and her brother Shi Lang is the main villain in the book.
And she is the perfect female supporting character in the book. The school sweetheart she secretly likes for a long time is the male protagonist in the book, so he is destined to never like her.
The reason why her brother tried every possible means to prevent her from courting the school idol was because if she continued to like the school idol, the final outcome would be a tragic death.

Shi Xiao, who knew the truth, was so moved that she wanted to thank her brother.

Shi Lang slandered Shi Xiao every day in front of the school boss: "Don't think she is clean and pretty like a little fairy, but her room is actually messier than a doghouse."
"She is very hypocritical. She said she studied very hard to get good grades. The results and the dark circles under her eyes were all caused by staying up late studying questions. It was actually caused by her staying up late every day playing games!"

After Shi Lang said this, the school boy's face gradually became gloomy, and his eyes were filled with disgust.

Shi Xiao was about to tell her brother that she knew his good intentions and would no longer be infatuated with the school sweetheart, when she suddenly heard the school sweetheart's voice: "What kind of brother is he who speaks ill of his sister behind her back?" When Xiaoxiao leaves later, I will beat you up to help Xiaoxiao vent her anger, bah! Brother Zha! ]

Shi Xiao, who thought the school boss had long hated him:? ? ?

ps: cp is the school idol, and my brother is an assist.