Wu Yixin saw that Cao Yi'er seemed to have an idea and thought of something, so he tried to pick up what he said: "Yes, there is a small river in the palace, flowing from northwest to southeast. It is also marked on the map Jishuikun stole."

"That's right, we can take the waterway. As long as the waterway is open, we can go in. It's too dark tonight. Let's go back and study it again."

When they got up together the next day, Cao Yier caught Ji Shuikun early and studied the map together. The map marked the Outer Tongzi River and the Inner Tongzi River. The Outer Tongzi River was the moat, and the Inner Tongzi River flowed into the inner river inside the city wall.

On the map, it is clearly marked in the northwest corner that there is a wall between the moat and the Nei Tongzi River, and there is also a wall in the southeast corner where you leave the palace.

Ji Shuikun suddenly remembered something, slapped his forehead and said, "I've seen that river, it's very small, and can only be passed by one person. I've seen that fence, it's thick, and the intervals are so thin that no one can get through."

It turns out that the design of the Forbidden City was flawed. The guards on the land were leak-proof, but there was no one to guard against the wall between the Tongzi River. The Tongzi River was a moat set up to defend against army invasion. There was a fence in the northwest corner that would block the filth.

The fence itself is also designed to prevent people from passing through. Ordinary people cannot pass through.

"But the biggest loophole of the Tongzi River is that there are no guards. As long as you can pass through the fence, you can drive straight into the Forbidden City." Cao Yi'er said. He decided to go back today to see if there is any other way.

That day, Cao Yi'er pretended to be a cart driver and pushed the cart from east to west outside Xuanwu Gate. When he reached the river, he pretended to take a rest and secretly observed the river.

He accidentally discovered that someone was cleaning the fence. It seemed that the fence was often blocked because of the very thin intervals, so special people came to clean it from time to time. Cao Yier saw a total of six people on the boat, and they were also pulling a boat.

On the sampan, use tools to throw the excavated water plants and garbage onto the sampan.

Cao Yi'er had an idea and figured out how to enter the Forbidden City. He almost screamed with joy. He followed the garbage cleaning team and found that they were not workers from the palace, but people from outside. It seemed that they were from the Ministry of Industry.

Or the construction team hired by the Ministry of Internal Affairs to clean up the water channels in the Forbidden City. This group of people did not go home after work, but went to a wine shop to drink. Cao Yi'er kept waiting, and when they made trouble until midnight, Cao Yi'er followed them inside

When he was drunk and wanted to open the door, Cao Yier punched him and knocked him unconscious.

When Xiao Wu Zhang Youyou woke up, he found that he had been tied behind his back, fell to the ground, and had severe pain in his head. He saw Cao Yier sitting on a chair, looking at him with a half-smile, and when he was about to shout, Cao Yier

A kick hit him in the throat, making him unable to make a sound. At the same time, Cao Yi'er took out a pill and stuffed it into his mouth. He then slapped his mouth with a palm. The force of the palm brought airflow and knocked

The pill was directly put into the abdomen of the little captain. The little captain was so frightened that his face turned pale, but he couldn't make a sound. He burst into tears and his original drunkenness was completely gone.

After a quarter of an hour, Cao Yi'er was sure that he could not spit out the pills, and then he unblocked the little Wu Zhang's acupuncture point. At this time, the sky was white, and when the little Wu Zhang saw the light coming from outside, he immediately called for help. Unfortunately, he

Not as fast as Cao Yi'er, he was kicked again and was speechless.

"Stop talking. You have already eaten my poison. If you don't have the antidote, you will definitely die within three days. Try it and see if you feel a sharp pain in your abdomen like a knife."

Originally, the young Wu Zhang didn't feel much, but after hearing what Cao Yi'er said, his stomach seemed to really hurt.

"If you want to live, don't scream. As soon as you scream, I will leave here and you can detoxify yourself. If you understand, just nod."

The little Wu Zhang was scared to death. At this time, Cao Yi'er agreed no matter what he said. He immediately nodded as hard as he could.

When Cao Yi'er saw that he was afraid, he removed the mute point.

"What's your name?" Cao Yi'er suddenly asked softly in a low voice.

The young Wu Zhang was at a loss, "The villain... his name is... Cao Shuang..."

He actually has the same surname as Cao Yi'er, Cao Yi'er thought to himself, this is rare.

"What is your responsibility in the Forbidden City?"

"Sir, I'm here to clean up the river." Cao Shuang didn't understand why this man, who was so powerful in martial arts, wanted to find him.

"Tell me what your main job is?"

At this time, Cao Shuang didn't know whether it was a psychological effect or the effect of poison. Beads of sweat broke out on his forehead. He held his stomach and was speechless.

"Say it quickly, don't worry about mother-in-law and mother-in-law." Cao Yi'er scolded.

"Yes, sir..." Cao Shuang said after a while.

"I mainly clear the blockage in the Tongzi River. The Tongzi River is often blocked by things, including garbage, aquatic plants, branches, leaves, etc. It needs to be cleared every three or four days on average."

"Once every three or four days, is it always broad daylight?"

"Sir, it's daytime. Clear the southeast corner first, then follow the Waitongzi River to the northwest corner."

"How many people do you have to clean up?"

"Sir, why are you asking so detailed questions?" Cao Shuang became suspicious. His work is related to the palace. Someone asking such detailed questions must be inquiring about information about the palace.

"Why are you asking so many questions? You don't want the antidote?" Cao Yi'er threatened him.

"Yes, yes, there are six of us in total."

"These six people are all old team members? Do you know Jin Yiwei?"

"I know, all the general affairs related to the palace are subject to security inspection. The Jinyi Guards will inspect you for three generations."

"Then when will you clean up next? In three days?"

Cao Shuang counted with his fingers, "Yes, we have fixed times, the first, fourth, seventh, and tenth days of the lunar month. Then four days apart, the fourteenth, seventeenth, twentieth, and then the twenty-third of the lunar month. On the twenty-sixth day of the lunar month, and then another round starts on the first day of the next month.”

Seeing that the man knew everything, Cao Yi'er expected that he was telling the truth. He took out a pill, took out a knife, and cut it in half.

"Okay, now, here is half a pill. Take it first to protect your heart, lungs and intestines from damage. You will wait for my news tomorrow."

Cao Yi'er turned to leave. Before opening the door, he said: "Don't forget, this is only half of it. It can keep you safe for fifteen days. If you tell what happened today, I will give you the remaining half." Just throw it into the Tongzi River and wait to collect the body."
Chapter completed!