Stay away from Conan.

"With this doubt, I found a way to visit the only music teacher on this island, who was Keiji Aso's first teacher on the piano. As the only music teacher on the island, since Keiji Aso and Kameyama are the four of them childhood playmates, then obviously, their music lessons were taught by the same teacher. And from that music teacher, I know one thing—”

Taking care of himself, Gao Yuan continued:
"That is, due to the lack of teaching resources on the island, that teacher has never taught musical notation. If it wasn't for Keiji Aso's outstanding musical accomplishments at the time, he was recommended by this teacher to go to a school in Tokyo. Otherwise, people born on this island can basically only understand musical notation——

"Therefore, I couldn't help but think of a possibility that when Keiji Aso communicated with Kameyama and others secretly, the codes used were actually written in simplified notation. The four of them couldn't read it at all, so they had the opportunity to save the score.

"However, although this result makes sense, after careful consideration, I still rejected this possibility——

"If Guishan and the others already know that musical notation can be a code for conveying information, then no matter whether it is written in simplified notation or five-line notation, Guishan and others will notice the difference. Moreover, it is not difficult to understand the five-line notation. Just find someone who understands music theory and convert the staff notation into numbered notation.

"Thus, after I denied this conjecture, since I already knew that Guishan and the others might not understand musical notation at all, is it possible that they don't need to understand musical notation at all?
"After all, using the opportunity of overseas performances to smuggle prohibited drugs, and then transporting them back to China through the hidden opening of the piano... Now that the entire smuggling route and process have been clearly regulated, the relationship between Keiji Aso and those four people is really Is it necessary to leave room to communicate in code?"

([-] words short, finished in the early morning, those who have already subscribed remember to refresh it when the time comes……………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… …………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… …………………)