I was reading with my sister and I accidentally became invincible

[Superpower] + [School] + [Passionate] + [Defending the Homeland] + [The Protagonist is Cool but Super Dotes on His Sister]
In his previous life, Zhong Yuan watched his sister fight a monster to the death, and eventually died.
When he opened his eyes again, the mysterious golden coffin made him reborn four years ago, and gave him a special ability: 100% success rate to absorb alien abilities, and he could rise to the top level.
Four years ago, his sister was only twelve years old, and had just been recruited to the School of Superpowers to practice, and was about to embark on the road of genius.
In order to prevent the tragedy from happening again, Zhong Yuan decided to go to the school to accompany her.
Who knew that he, an auditor, encountered school bullying as soon as he entered school...
Zhong Yuan scolded: "It's too chaotic! Fortunately, I came to accompany my sister, otherwise I really don't know how my sister would be bullied!"
Everyone cried and begged: "Zhong Yuan, control your sister! She is simply lawless and doesn't let people live!"
This book is also known as: "Crazy! Is there a companion like you?", "I dote on my sister with my strength, what can you do about it? ”, “Brother, you’re exposed! And you still say you’re not a genius? ”