Gu Shi squatted down in front of the specially cleared road, observed it for two seconds, raised his head and asked doubtfully, "Is there something wrong with this?"

Cheng Xuqing took out a shovel from somewhere and shoveled a few more times along the edge of the road.

Only then did Gu Shi see clearly that the black was not the original color of the road, but was painted on it like paint. The normal road surface is grayish in color.

The edge of the exposed black line is quite smooth and flat. It is definitely not a trace left by mud, but is drawn by humans.

Gu Shi touched his chin. "It's indeed very suspicious. Leaving such a mark in the sewer can't be for aesthetics. Do you know how wide this line is?"

Zhao Zhize replied: "So far, we have only discovered what is on the map, but it seems that this is far from all."

"I think there must be a big secret hidden in here. Maybe there is a hidden secret room in this sewer, and it is filled with treasures left by our ancestors."

Cheng Xuqing deliberately lowered his voice, as if he was afraid of being heard by others.

Gu Shi thought for a moment and then asked, "Judging from the growth of the moss, these lines must have been there for quite some time. Have you asked the people in the sewers when these lines appeared?"

Zhao Zhize nodded and said, "I've asked several people, and they can confirm that these lines appeared about a year ago.

According to these people's description, these lines appeared suddenly and they didn't know who left these traces.

However, it is impossible for so many traces here to appear suddenly overnight. There must be a few people who know about it, but we just haven't found out.

At first, some people were curious about the purpose of these lines and explored them, but later, nothing was found and the matter was dropped.”

Gu Shi stood up and patted Cheng Xuqing on the shoulder, saying with some emotion: "I now believe what you said a little bit. Maybe there really is some secret hidden behind these lines."

Cheng Xuqing said as if it was a matter of course, "That's right. This sounds so strange. It's impossible that someone was just bored and drew these lines."

Gu Shi joined Cheng Xuqing's sewer exploration team and followed them in the sewer every day to track the end of the black trace.

With the addition of Gu Shi, the wind mage, their movement speed increased a lot.

"Come and look at this."

On this day, they were exploring the sewer as usual. Suddenly, Cheng Xuqing seemed to have discovered something special and called the other two over.

Gu Shi and Zhao Zhize walked over and found that the black marks here were no longer flat lines, but were connected to a circular pattern.

Only after they cleared the nearby silt could they see clearly that the traces on the platform were several long lines connected around a circle, and an extremely strange symbol was drawn in the middle of the circle.

Cheng Xuqing guessed, "We've been searching for this for so long, but this is the first time we've seen a circular pattern like this. Could this be the center of those black lines?"

Gu Shi suggested, "That's a possibility. Let's use this pattern as the origin and follow the lines extending outward from it to find it."

"Can."

"I have no objection."

The three of them decided on their next course of action.

So, over the next period of time, they followed these lines and discovered several similar circular patterns.

On this day, it was raining heavily outside the window. Gu Shi and his friends were resting in the hotel. In this kind of weather, there was a risk of the sewers being flooded, so they simply took a day off.

Gu Shi sat by the window studying the map. Thanks to their efforts over the past few days, the route drawn with a red pen on the map had expanded a lot. They also marked all the locations where circular patterns were found as key points.

Gu Shi supported his head with his hands and stared at the map. All kinds of guesses emerged in his mind. Suddenly, a flash of inspiration flashed through his mind.

If we ignore the other complicated lines and only look at the three dots that have been discovered and the lines connecting them, is it possible that this pattern is a hexagon?

Gu Shi compared the two connecting lines again, picked up a pen and made a mark on the possible location where the circular pattern might appear.

Because this map is a map of the city above Root and does not include the sewer section, the locations they marked are not particularly accurate.

But as long as another circular pattern can be found at this location, it will be possible to verify whether Gu Shi’s guess is correct.

If it wasn't raining outside, Gu Shi would have wanted to put his idea into practice right now.

There was a breakthrough in the matter that had troubled him for so long, and Gu Shi felt a lot more relaxed. Since there was nothing to do in the hotel, he decided to go out for a walk.

It has been such a long time since he came to Root City, and he has been busy investigating the sewers, so Gu Shi has not had a good time to explore the city.

Zhao Zhize saw Gu Shi suddenly changed his clothes and asked, "Gu Shi, are you planning to go out?"

Gu Shi nodded and said, "Well, I haven't been to the streets much since I came to Root City."

Zhao Zhize asked again: "Do you have an umbrella? I have extra ones here, do you want one?"

Gu Shi really hadn't prepared an umbrella.

It rarely rains in Congleton, and Gu Shi has basically never had to go out on a rainy day. Now he can use magic power to raise a barrier to block the rain.

However, he did not reject Zhao Zhize's kindness. Walking in the rain with the magic barrier might be a little conspicuous, and Gu Shi did not want to attract too much attention.

"Give me a handful."

Zhao Zhize handed Gu Shi an oil-paper umbrella.

There were no umbrellas in this world at the beginning. When it rained, people wore heavy raincoats or let the rain pour down on them.

The umbrellas that are gradually becoming popular now are products sold in schools. Of course, there are also many imitations from other businesses on the market.

Gu Shi walked out the door holding an umbrella.

In such weather, there were naturally not many people on the street. He strolled around leisurely and suddenly saw a restaurant that was crowded with people even on a rainy day.

Gu Shi was a little curious. He had only stood there for a while when he saw three carriages parked in front of the door of the restaurant. A restaurant with so many customers even on a rainy day must have something special.

Just then, Gu Shi felt a little hungry, so he followed those people into the restaurant.