Shen Han is the "Cold Blade", a modified human weapon cultivated by the "Nest" organization. He was genetically modified since he was a child and turned into a ruthless tool to perform tasks. His core mission is to hunt down Shadow Eclipse. He has performed many tasks such as eliminating inferior shadows, protecting target persons, and stealing confidential information. In the confrontation with shadows and other forces, he has demonstrated super combat power and absolute obedience. During this period, he encountered a near-death crisis, interacted with the demon hunter "Lone Wolf" and Lilith, and also experienced provocation and purges within the organization. Faced with threats such as the "Shadow Alliance" killer "The Butcher", he always responded with ruthless methods, but in his every experience, he also had a faint thought about his own destiny. Under the cold shell of the weapon, there was a glimmer of humanity that had not been lost.