Welcome to the Center of the Earth (Part 2)

After some time, they invite Suneo and Gian to visit; the underground world is now quite advanced, with many modern buildings. Suneo and Gian manages to sneak into the underground area with a reporter, but they encounter a monster. Only after they come out did they call the other reporters to come over. Nobita invites "Pyron" to his house to watch TV and see his zero-mark test paper. However, the two return and leak this information to the media, causing a sensation. The Prime Minister even wants to occupy the underground kingdom. In order not to disturb the lives of the underground dwellers, and because time is running out, Nobita thanks "Pyron" for teaching them to speak, start fires, make stone tools, and save their lives, and sends it back to the underground city, as well as destroying the microphone, which means he can't go back, because Suneo and Gian can copy the badge. The other reporters told the journalist to stop. Nobita receives a badge bearing his image and that of "Pyron," and finally, he goes home to sleep.