Analysis: The protagonist's identity as a "traveler" and the world he lives in (the maritime world, namely "One Piece") are quickly explained. This is one of the most popular openings at present. Then, through the specific and well-known character of "apprenticeship to Koshiro Shigetsuki", the distance with readers is immediately shortened, because readers are familiar with this IP and character. The most important thing is that it directly throws out the core golden finger of the protagonist - "Heaven-defying Comprehension", which is the basis of all subsequent powerful abilities, giving readers extremely high expectations for the protagonist's growth rate and upper limit.
