"You mean to say, if the letter is intercepted, then once that person successfully delivers it, he'll be caught by the Ghost Post Office and it will be judged as him, allowing him to move to the second floor?" Li Yi was not stupid and understood immediately.
Wang Chuan nodded with a smile, "Your comprehension is strong, yes, that's exactly it. It's a loophole. If you're eager to go upstairs, hijacking the third letter could let you go straight up."
"What happens to the Messenger whose letters get intercepted?" Li Yi asked.
Wang Chuan explained, "They will be judged by the Ghost Post Office as newcomers and have to start again from delivering the first letter, but on the same floor as before."
"Why do you know this so clearly?" Li Yi was surprised.
Wang Chuan took a sip of his beer and said, "Because I've done it myself. I've delivered the third letter more than once, and several Messengers have been sent by me to the third floor, so I stayed on the second floor for a long time."