In a modern city, a boy adopted and trained by the Assassin Alliance in an orphanage joined forces with foreign enemies to cleanse the entire alliance when he took over as leader. However, the boy disappeared. Some people said that he was dead, killed by the former leader in a dying counterattack. Some people say that he is still alive and has become an ordinary person incognito. Others say that he has traveled through time and gone to the world in the book...