System of a Wolf Style Fighter

A singer of a popular boy band is caught in a huge mess and ends up missing. Despite quickly becoming one of the most famous missing persons in years he was never found. After going through an unfortunate kidnapping the singer ends up in an underground fighting pit. He is hidden behind a mask and is forced to fight in life or death fights including, knives, guns, and fists. After fighting for over a decade, the once popular singer finally decides to stop his endless fighting and gets himself killed. But instead of an afterlife he wakes up in his old bedroom from when he was 15, with a wolf style fighting system. He plans to use this newfound system to exact his revenge upon the people who put him in the underground fighting pit. But first, he enjoys his life...and the family he never thought he'd see again.