[Comprehensive British and American] Cleaners Fight, but the Top Killer

"There is no fear in the eyes, just a desire to work." The former world's number one top killer, John Manny, honorably announced his retirement after completing his nth assassination mission in his life, ending his 22-year career, and then happily and happily ran towards his ideal career - a crime scene cleaner. Q: How to become a crime scene cleaner? John replied: Nothing but quick hands. John, who graduated from the Crime Scene Cleaner Night School (CSCS for short), was dispatched as an outstanding graduate to the most dangerous and workload-heavy Gotham City. Here, he started his great career as a legendary cleaner... ———— Some super-reverse: (expletive) (emotional) What kind of janitor can kill six gun-toting men with a ballpoint pen in one minute! Some bats: (surprised) (confused) (wary) (watching John mopping the floor again and again while breaking the criminal's bones without leaving a trace) Is this right? Some bau: (encountered John who was cleaning up the crime scene) (gasps) (attempted to analyze but failed) The man ran away so fast that he became a shadow. They couldn't even see his face and body shape, let alone analyze... ———— The protagonist's strongest combat power as a killer is unexplained. He has the ability to "turn anything in his hands into a killing tool." He is now 27 years old but was forced to work for a black-hearted killer organization when he was five years old. After graduating from CSCS, he is 28 years old. He is a man with super strength who cannot be seen in appearance but has muscles (he usually wears a mask because his good-looking face will be remembered). The killer wears a suit when working, just like his predecessors John Wick and John Reese (from the "John Wick" series of movies and the American TV series "Person of Interest" respectively, but these two will not be mentioned in the text, it is just a special name for the protagonist John). When working as a cleaner, they will wear a uniform yellow cleaner uniform (the skin will change). The full name of CSCS is Crime Scene Cleaner Night School, which is inspired by the game "crime scene cleaner" but does not comprehensively include the content in it. The main game is in Gotham. It does not follow the original plot and follows John from the perspective. The protagonist's brain circuit is very strange, and he feels a little off the beaten track (?). Others to be added... Concept: There is no fear in the eyes, only the desire for work