What does Kudou Yū saku's signature mean at the end of Conan's 33rd episode?
The so-called treasure is what Conan experienced on the treasure hunt. After overcoming difficulties with the help of friends, this will be their most cherished wealth, and it will last forever. This is written by Conan's father (because of K O's personality (∩_∩)O~). Finally, Conan also left his name on it, and he may hope that his children can experience such wealth in the future.