It might not be exactly what you want, but I'll try my best to recommend a novel that's most relevant to your description: " The Days When the System Forced Me to Be a Navy Undercover " is a light novel by the author, Elephant Lion, Tiger, Wolf, and Leopard. It's a derivative Doujinshi novel. The general plot of this novel is as follows: The Revolutionary Army obtained the Navy Achievement System. This was destined to be a subversive story…Someone brought a straw hat group and soared to the sky, slapping their faces all the way. Someone was suppressing the three generals in the navy and contradicting the marshal. Someone had transformed into a revolutionary army and plotted to seize ancient weapons, dragging the lofty Heavenly Dragon people down to the mortal world! All the exciting scenes were recorded in " The Days When the System Forged Me to Be an Undercover in the Navy ". ---------------------------- Ten Years of Navy Undercover, The Warring States Period Made Me A Pirate was a light novel by the author, Forgetful Laughter. It was a derivative doujinshi novel. The general plot of the novel was: I've been undercover for ten years, and I've finally become a general! In the end, the warring states made me a pirate? ---------------------------- One Piece Set Flight was a virtual online game novel written by the author, Zai Xu. The general plot of the novel was: Hire partners, ride the sea, and write your own legend on the great sea route. ---------------------------- " You call this undercover?" This book was a novel by the author, Don't Eat Scallion, about the infinite universe. The general plot of this novel was: Fake undercover agents-carefully hiding their identities, acting as a scoundrel against their conscience, occasionally touching compassion and secretly acting as a good person, meeting up with the people on the line was like having an affair. A real undercover agent-bold but careful, ruthless and merciless, openly handing a small note to the police to report the opponent. ---------------------------- One Piece's Dark Manipulation was a light novel written by the author, the King of Terminal Bones. The general plot of the novel was: On the surface, Qin Ye was a righteous and hot-blooded navy, but in the dark, he was a villain who manipulated everything. It was a story about the Dark Emperor who was in the world of pirates, manipulating everything and playing with people's hearts. Non-system style, the main character was a villain. ---------------------------- " The Ocean of Spy Mandarin Duck Daggers " was a military-spy novel written by the author Shi Jian. The general plot of this novel was: In the autumn of 1939, Chen Yang, a special agent from the Sanqi Group, codenamed " Nail ", who was lurking in the No. 76 Investigation Office, cleverly used the subtle gaps between the various forces in the dangerous situation of the tiger watching the wolf. He defeated the Japanese conspiracy many times, dealt a heavy blow to the arrogance of the enemy agents, and also gained a beautiful love. This book has a fast pace, humorous dialogue, exquisite feelings, beautiful strokes, clear characters, and distinct characters. ---------------------------- One Piece was a light novel written by the author Snake Grass Floral Dew. The general plot of the novel was: " We agreed on three years. Three years later, another three years. Three years later, another three years. I'm about to become the Fourth Emperor, Boss." "Can you be nicer to me? Now that I'm the only one who knows that you're a spy, I'll go back and delete your information. I won't have to worry about you being the Four Emperors for the rest of your life." From an agent to the king of the world. This book is also known as One Piece Infernal Affairs, One Piece: The Reconnoiter, and One Piece 007. -------- His new book," Making Games from the Ninja Realm," asked for support! ---------------------------- One Piece Reborn: Vice-Captain was a light novel by the author, Tian Jing. The general plot of the novel was: The desolation of the former navy genius, the expert whose name shook the great sea route, on the day he betrayed the navy! Was he a spectator living in the Grass Hat Pirates, watching the arrival of the era, or was he unable to escape the choice of fate? In this turbulent era, one man and one sword, walking on the road of seeking answers or realizing their own ambitions. On this great sea route, everything was still like fate, changing! I created a new book friend exchange group, welcome to join! 555368384。 ---------------------------- One Piece: The Fruit of My Manipulation was a light novel, a derivative doujinshi novel, that was written by the author, Unmoved Heart. The general plot of the novel was as follows: This was a pirate who had accidentally become a member of the navy. Later, he joined a group of righteous people and was fearless of the world government's restrictions. ---------------------------- " The Unparalleled Rebirth of Pirates " was a light novel by the author, Burning Thoughts Becoming a Saint. The general plot of the novel was: Mu Yang was a loyal fan of One Piece. In an assassination that should have been flawless, Mu Yang was arrested because of the betrayal of his best friend. After he died, his soul came to 'one piece.' If the readers liked it, it would be the greatest encouragement to the author. Although the protagonist of this book will join the straw hat gang, but it is not purely with the boat flow, this book will force the obsessive-compulsive disorder, please take a detour...