After my sister died, I became the enemy of the whole world!

Chen Ze obtained a proficiency system, but was sent to a mental hospital because of his mental disorder.
Four years have passed, and he has upgraded all his skills to full level.
His only weakness is his sister who often comes to visit and chat with him.
As a parent, I sent the notice of my sister's critical illness to the hospital and saw the diagnosis that my sister had broken bones all over her body.
He knew it was time to leave the hospital.

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