Assassin's Battlegrounds

A mysterious killer without a name has a tattoo on the back of his head, which is his name, his code, and his sin. As long as someone pays him, he will carry out the mission. However, during a political event, the killer encounters an unexpected situation and becomes the target of both the International Criminal Police Organization and the Russian army. As he flees, it is also the moment when he begins to fight back. But the biggest enemy is ultimately the agents from various countries who are chasing him or the people he was sent to kill before?