At 7:50, we successfully arrived at Building 3, our target being Room 802 on the 8th floor.

"Luckily, there are several elevators. Let's hurry!" Zhang Shirun pointed ahead.

Meanwhile, the students who came with us also rushed towards the elevator ahead.

"No! Don't go in!" I promptly stopped the three of us from entering.

"Why?" Zhang Shirun asked.

"There is no first floor in the elevator of the teaching building. Did you all forget?" I said.

Wang Jiayi said, "Are you blind? Can't you see it says 2F over there?"

I quickly shook my head, "That's even more wrong!"

"What's wrong?" Wang Jiayi asked.

"It's clearly level ground here. How can it be labeled as 2F? Are there two more floors below?" My words aroused their alertness. So Zhang Shirun looked down into the gap ahead, and to our surprise, she saw that the floor below had -1F written on it. That means the current level with the elevator should be 1F, not 2F. It's clearly a trap!

The elevator door was about to close, and we didn't have time to shout for the others to come out. In order not to be late, we decided to go up the stairs, the most reliable way.

Those who couldn't catch the elevator had no choice but to run with us.

In times of crisis, one's potential is maximized.

Despite not being very athletic usually, I managed to run all the way to the eighth floor in a few minutes.

But the next problem arose. Because the first floor was labeled as 2F, the current eighth floor is labeled as 9F.