Yang Jian obtained a lot of useful information from this person named Old Li, information that was crucial and important, allowing him to have a general understanding of the situation on the fifth floor of the post office.
According to Old Li, the messenger on the fifth floor of the post office had stopped delivering letters for a long time because the black letter was left in room 502, causing the post office's operations to be unable to function properly, while the previous messengers on the fifth floor lived comfortably without any issues.
Previously, some messengers who came up from the fourth floor gained temporary freedom as a result, while some chose to, like Yang Jian, enter room 502 to try to take away the black letter to restore the post office to normal, but unfortunately, the previous people all failed.
The prolonged stalemate made Old Li realize the severity of the issue.
The post office was losing control.
