Lone Agent: Chasing the Murderous Purple-Blooded Man at the Beginning

This is a time travel fantasy novel: Mysterious Visitor, Purple Blood. He possesses supernatural powers and has been living on Earth for nearly a thousand years. Triggering a war, the situation is critical and about to break out. Agents and spies, the enemy and ourselves, intelligence games, twists and turns. Please tell me, who wins, who loses, and who is the hero? Could war break out?