Zhang Yichi's heart was beating wildly, and a feeling of sudden enlightenment exploded in his mind, and he felt that things might have taken a turn for the better. With a slightly stiff step, he stepped into the hallway and pressed down the handrail of the door with his hand.

The door is locked.

But this did not hit Zhang Yichi at all, and he guessed that this should be the basement entrance for the storage of residents in each unit.

If this guess is correct, then he should also have a key that can open the basement. He placed the plastic bag containing the instant noodles on the ground, pulled out the keychain, and began to try them one by one.

"Boom!"

Unexpectedly, when I tried the third key, the key really opened the door!

Zhang Yichi showed a smile for the first time in a long time, he gently opened the door, it was dark inside, and he could only see a staircase extending downward through a little light outside.

He turned on his phone's flashlight and shone it down, and at the end of the stairs was a wall, and on the left and right sides looked like a narrow corridor. After hesitating in place for a few seconds, Zhang Yichi looked around, made sure it was safe, lifted the plastic bag and walked in, and closed the door by the way.

By the light of his phone's flashlight, he reached the end of the stairs, where there were narrow corridors on the left and right, and doors lined up on either side of the corridor.

The scale of this basement is beyond Zhang Yichi's imagination, and it is roughly estimated that there are at least hundreds of storage rooms. He flipped the light switch on the wall, and the basement suddenly lit up.

Turning off the flashlight of his mobile phone, Zhang Yichi began to check the specific situation. Some of the doors of the storage room are open and some are closed, and it is estimated that the locked ones are all sundries placed by the residents.

Zhang Yichi walked thoughtfully towards the depths of the corridor, and after walking for about ten meters, he found that another upward staircase appeared on the side of the corridor.

This made him wonder why there was still a staircase, could it be that the staircase he walked on could lead to the basement? He climbed the stairs and tried to open the door, only to find it locked.

He frowned, took out the key that opened the basement door just now, and tried to open this door, but he didn't expect it to open!

As soon as the door opened, another corridor greeted you!

Zhang Yichi was a little stunned, he slowly walked out of the basement, looked at the corridor, and realized the most special place in the basement. But he didn't dare to jump to that conclusion, he retreated back to the basement to lock the door, and walked down the stairs briskly towards the deeper part of the basement corridor.

So, he found one staircase after another leading to the top!

"I see." Zhang Yichi couldn't help but muttered to himself.

No wonder the basement is so big, it turns out that it is shared by the residents of the entire residential building with six units! The six staircases leading to the top correspond to the stairways of each of the six units. In other words, the residents of all six units of this building can access it through the basement door of their unit's stairway.

As for why the door key of the four-unit basement where he is located can open the door of the three-unit basement, Zhang Yichi feels that this is easy to explain. After all, all six units of occupants can come to the same basement, so there is no point in changing their door locks to different ones.

Zhang Yichi, who had an unexpected gain, always felt that this could help him in a way, so he took his things back to the corridor of Unit 4, locked the basement door, and went upstairs to return home.

When he entered the house, he threw the plastic bag directly on the side of the sofa, Zhang Yichi turned out the paper and pen, and began to write and draw on the coffee table.

Covering more than half of the paper is a rough map, with the neighborhood where Zhang Yichi lives on the far right, the adjacent school directly above the neighborhood, and the left side of the neighborhood is the overpass, the square, the Yonghe community, and a long grove.

After drawing the map, he immediately listed the two main problems he was facing on the edge of the map.

'How do you clean the blood off the walls?' ’

'Where is Lu Tao's body hiding?' ’

Around these two cores, Zhang Yichi wrote down all kinds of information he encountered along the way. The neighbor on the opposite side is renovated, and there is a ladder to the roof on the sixth floor, but it is locked, connecting the basement of the entire building's six units......

Eventually, Zhang Yichi connected some of this information to two issues.

……

Night.

Around one o'clock in the morning.

Zhang Yichi sat on the sofa in the living room, he didn't turn on the light, so the room was pitch black. Feeling that it was almost safe enough, Zhang Yichi got up and pulled open the curtains of the window to look outside.

Of every residential building in his sight, only a few houses had their lights on.

Standing by the window and silent for about a few minutes, Zhang Yichi walked towards Lu Tao, who was wrapped in plastic wrap, he stretched out his hands under Lu Tao's body and slowly lifted up.

Lu Tao's physique is similar to him, and it is not particularly difficult to lift it up under normal circumstances, but now Lu Tao is dead, which makes him can't help but snort, gritting his teeth and picking Lu Tao up.

It is relatively labor-saving to carry nature on his back, but Lu Tao is wrapped in a ball, and it becomes inconvenient to carry it on his back.

Holding Lu Tao's body to the door, Zhang Yichi gently pressed the doorknob, and the anti-theft door opened.

The lights in the corridor are voice-activated lights, and Zhang Yichi is reluctant to make a big noise, so he can only go downstairs with the help of the faint moonlight projected in.

Holding the corpse and slowly going downstairs step by step, Zhang Yichi's exhaled breath spat on Lu Tao's cold corpse. Sweat quickly soaked his clothes, and he didn't know if it was a delusion or if he really smelled a strange smell that made his stomach a little uncomfortable.

It took three minutes to carry Lu Tao down from the sixth floor to the first floor with difficulty. These three minutes were almost the longest period of his life.

In front of the basement door, Zhang Yichi held Lu Tao's body with one hand, and took out the key with the other hand to open the basement door. It's early in the morning, and almost no one will go out, so Zhang Yichi didn't free up his hand to close the door. hugged Lu Tao down, and then came up again and closed the basement door.

Looking for a storage room with a lot of miscellaneous items and it looked like no one had been here for a long time, Zhang Yichi put Lu Tao's body in the corner and covered it with other things.

After doing this, Zhang Yichi went upstairs again, and put Lu Tao's schoolbag, glasses, as well as his bloodstained clothes, murder weapons, and tools used to clean up the scene.

After carefully checking and confirming that there were no mistakes, Zhang Yichi closed the door of the storage room and returned home without leaving a trace. Closing the door, his body suddenly slackened and leaned against the door.

He was nearly collapsed, drenched in sweat. After a long time, he tried his best to go into the bathroom, came to the sink, turned on the faucet, filled the washbasin with water, and plunged into it......