The Wonder Exploration Cotton Candy Key Name Study is a key name learning textbook for children who are just starting to learn piano.
With tips from octopus and squid friends that help children learn on their own, rather than boring study using simple memorization methods,

Artistic - Color-coded naming and sticker-sticking activity
Physical - Remember the names of the steps by body position
Understanding the names of levels with mathematical symmetry

It is designed to be fun to learn and understand the names of the clans by linking them to other areas. The cover includes illustrations of Changdeokgung Palace, Taj Mahal, Moai, Statue of Zeus, Troy, etc. to provide children with fun and useful learning information.
The expedition to find the wonders of the world and UNESCO, the back cover contains the expedition report of the wonder expedition.