Frightening Birds

A young man with unknown origins but outstanding martial arts skills suddenly appeared in the world with the "Ice Muscle Square Inch", a martial arts treasure that had been stolen for seventeen years, causing undercurrents to emerge in the long-quiet rivers and lakes. All forces took action one after another, but their goal was not the treasure itself, but to track down the person who stole it. Some people want to ask a secret from the thief, while others want to kill people to cover up this secret. What is the secret? Who is this mysterious boy...