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He, Tian Yuan, is a person with no memory at all. In order to retrieve his lost memory, he was forced to join the "Dark Prison" and became a killer - staying in that place more mysterious and terrifying than hell for ten years.
It took ten years for him to become a top killer. People who know him say he is too gentle and kind; people who have never met him say he is a hellish Shura and too terrifying.
He is too perfect, and the only shortcoming is probably his eyes - he cannot see.
He created a myth for ten years until he knew his secret...