1 episode 5 12 tells that teacher Xiaolin found a cowhide wallet in the library with a note left by Xiaolan primary school in the first grade. This goes back to ten years ago. In order to confirm the truth of the rumor, Xiaolan and Xinyi visited the campus overnight. Unexpectedly, they met a mysterious man who claimed to be Xinyi's younger brother in the school library. He challenged Xinyi, left a cowhide wallet with a secret code and left.
2. In episode 5 13, Xinyi, Xiaolan and Agasa Hiroshi follow the instructions of the secret code and find the last secret code on the roof. Agasa Hiroshi said it might represent the direction, but Xinyi thought it was all a sign that Dad wanted to watch the sunset. After telling this story ten years ago, Conan suddenly realized that something was wrong, so he rearranged the incident.
Extended data:
Plot introduction:
Kudou Shinichi is a high school detective. When he went to the amusement park with his girlfriend Mao Lilan, he found two men dressed in black behaving strangely. Xinyi followed them to trading places. When he was not paying attention, he was knocked down from behind by a man in black, and he poured mysterious poison in an attempt to kill him, but his body actually returned to the state of a developing child because of side effects.
At Agasa Hiroshi's suggestion, he decided to hide his identity. Considering that if the man in black knew that he was still alive, it would definitely implicate his relatives and friends, so he took a new alias of "Edogawa Conan" and lived in Mao Lilan, hoping to find the man in black with the help of his father Richard Moore, who is a detective.