The story tells that Lu Dan, a real-world traveler, was forcibly pulled onto a ship by Luffy and became a shipwright. After that, he activated a golden finger called the "Unconscious Ability Extraction and Strange Synthesis System". In the process of following Luffy's adventure, he not only used various strange abilities to assist the team, but also his personal goal gradually sublimated from "living" to joining the revolutionary army, overthrowing the world government, and participating in the grand journey of building a new world order.
