Nobita's grandson Shixiu saw that Doraemon had not been able to change his Grandpa Zeng for so long after coming to Grandpa Zeng's era, so he decided to change his grandfather Zeng to a robot. Doraemon knew that he was about to be separated from Nobita and was very reluctant to leave. He asked Shixiu for another chance. If Nobita did not make progress, he went back with him. What would be the result...