A powerful man targets a young man named Adam. He sends the world's deadliest assassins to kill Adam. The assassins succeed and Adam is killed.
But death is not the end for Adam. He mysteriously wakes up alive in his school. He has returned to a time just before he was murdered. Adam learns he has a new power. Whenever he dies he instantly comes back to life. He always returns with full memory of his death.
Adam now knows the future. He uses this knowledge to turn the tables. He hunts down every assassin sent to kill him. He eventually finds the powerful man behind everything. Adam kills him too.
This revenge makes Adam the world's most feared assassin. Now all the world's governments are afraid of him. They send their best police and spies to eliminate him.
Adam is still only nineteen years old. He is caught in an endless cycle of death and rebirth. He fights to survive. He unwillingly kills every agent and officer sent after him becoming the very thing he fought against.
It was fun reading your book, Why don't you update more chapters.