On a trip to Poland to attend the International Chopin Piano Competition, Do To-ri inadvertently enters into a treasure hunt when his pen pal shows him a mysterious diary. The clues, intertwined with Poland’s World War ll history, bring To-ri face-to-face with Poland’s colourful culture and painful past. Join To-ri and his pen pal as they encounter Chopin’s melodies, dwarves, and more on an exciting hunt for Poland’s treasure.