Pirates: Starting with the Undercover Whitebeard Pirates

My name is Murphy, a traveler in the pirate world and a trainee sailor. Now I have received a task, which is a "very simple task"... That's what my boss said just now. Now I was looking at him with doubtful eyes. "The plan is very simple. You go to the Whitebeard Pirates, gain trust and then take the opportunity to deal with Whitebeard... Undercover first, then kill. It's simple and easy to understand. Are there any questions?" "Sir, I have so many questions but I don't know where to start." I don't want to ask questions, I just want to greet the chief's relatives. This book is also known as "One Piece: I Ate Ten Thousand Devil Fruits", "One Hundred Ways to Use Devil Fruits", "I'm Determined to Be the Undercover King", "Learning Skills Can't Save the Pirate World"...