Then Luffy received a call for help and went to an island of ice and fire, an abandoned experimental island left by a fight between red dogs and young children. Caesar, a former naval scientist under Dover Langmingge, conducted a poison gas experiment on this abandoned island. Luffy saved a group of children Caesar used for experiments on the island, and met Smoker and Luo. At this time, Luo was already the seventh Wuhai and knew Dofu Longming. However, Luo was not content with the status quo, and formed an alliance with Luffy * * * to fight against the beasts of the Four Emperors, Kado. First of all, it is necessary to destroy the demon fruit processing factory in Kedo, whose raw material is the poisonous gas used by Caesar for experiments. Only Caesar can make this poisonous gas, so Luo plans to catch Caesar first and force Dover Langmingge to step down from the Seventh Wuhai to give up the throne, and let Luffy sneak into and destroy the factory when he gives Caesar to Mingge. But Brother Dover Langming has the burnt fruit of Ace to lure Luffy into a contest ring. At present, Luffy is participating in the ring competition. Luo took Wu Suopu and others to trade Caesar with Ming Ge. At the same time that Luffy formed an alliance with Luo, Kidd AppleHawkins, who was in Luffy's era, also formed an alliance, which may also be to start work on a certain four emperors.