Doomsday Practice Room

When the local station, famous doctors and teachers gave live lectures, and elderly audiences were gathered together, a scam began. You need to care more about your family! The old man is not feeling well. Go to the hospital quickly to calm him down. Don't be fooled by old Mongolian doctors, old professors and old experts.

Pretty good novel, I like it very much

What is this written about? Only the first few dozen chapters are doomsday, but are there groups traveling to another world in the later chapters? The more I look at it, the more confused I become.

The first part is pretty good, but the second part is completely confusing. I don't know what it's about.