The next morning, Xue Kaimo saw a missing object notice from the Department of Physical Education on the notice board in the lobby on the first floor of Building 1, which said that eighteen javelins had been lost in the gymnasium overnight and that clues were being collected in the school.

"It's really sick, what are you doing stealing so many javelins at once. Xue Kaimo muttered to himself as he left the notice board and walked towards the stairs.

Walking down the stairs Chang Xiao and Qi Xuan, who was teaching linguistics, Xue Kaimo greeted them and passed by the two of them, and heard Qi Xuan ask Chang Xiao, "Do you have time at night, let's go to the movies together, there is a game at half past seven." Chang Xiao replied, "No, I have something to do tonight." At this time, the clock in the hall rang suddenly, and Xue Kaimo turned his head to look at the brass-colored clock above the front door of the hall, it was half past ten in the morning, and Director Li's gloomy thin face seemed to appear on the glass cover of the clock. Xue Kaimo blinked, and the thin face disappeared.

"10:30, is this a coincidence or is it a hint to me that Chang Xiao and Director Li made an appointment yesterday, and Director Li's face on the surface of the clock is that I am dazzled?" Xue Kaimo had been thinking about this problem that gave him a headache all morning, and finally decided that he would try it regardless of whether the time was accurate or not.

At ten o'clock in the evening, Xue Kaimo left the dormitory and told the aunt in the mailroom of the dormitory building that he had a stomachache and wanted to go to the infirmary to prescribe medicine. At 10:15, Xue Kaimo walked to the administrative building.

On the left side of the administration building, there is a small piece of wasteland that has been abandoned all year round, and it is said that the school is going to plant this wasteland into a flower garden, and at this time, a screen more than one person high has been pulled around the wasteland to hide the decay inside. Xue Kaimo found a gap in a gauze net, he got in, squatted down and faced the direction of Building No. 1, quietly waiting for Chang Xiao's arrival.

The moonlight tonight is just right, if there is no gauze to cover it, Xue Kaimo's shadow must be very conspicuous on the ground. Xue Kaimo raised the collar of his clothes to resist the autumn wind of the night, and he occasionally turned his head to look at the dead silence of the administrative building, which at this time was like a huge dead dog lying prone in the night, only the glass doors and windows reflected the moonlight. Suddenly, Xue Kaimo seemed to hear some kind of dull sound from under his feet, like someone digging something, and like the sound of a hammer or chisel hitting the dirt, and the sound occasionally had an echo of metal, and when it stopped, it should be matched by a slight tremor that was almost imperceptible on the ground.

Just when Xue Kai was indifferently paying attention to the sound of nothingness underground, a thin figure walked from the direction of Building No. 1, and in the hazy moonlight, strands of thick long hair fluttered behind the figure's head, and Chang Xiao appeared.