The " Heavenly Dragon " in One Piece wasn't made up of 34 families. Instead, it was an existence that possessed extraordinary abilities and was beyond the scope of ordinary humans. According to the latest storyline, Luffy and the others had discovered the secret of the " Heavenly Dragon People " and learned that they were actually transformed by a mysterious drug and not ordinary humans. Although some of the " Heavenly Dragon People " had extraordinary abilities, there were also some families that did not join them, such as the " Mermaid Race " and the " Dragon Race ". Among them, the Mermaid Race could not join the Heavenly Dragon Race because of their unique physiological structure, while the Dragon Race did not join because of their beliefs and other reasons.