Siheyuan (courtyard house): My father, Li Yunlong!

Li Zhenhua was overjoyed.

This stuff was a rare commodity in the early 1960s, especially the finished canned goods in glass bottles, with their golden color and tempting appearance. They were definitely a high-class gift for visiting relatives and friends and building relationships, much more impressive than carrying a box of pastries.

Without hesitation, he clicked to buy, and ten heavy, cool glass jars of food instantly appeared in his system space.

"Good things should be kept for now; they'll come in handy someday."

Li Zhenhua thought with satisfaction, and then turned his attention to the most pressing issue at hand.

How to quickly solve a radio station case? He entered keywords such as "investigation," "detection," and "radio" into the search bar of the online store.

Instantly, a dazzling list of products appeared, overwhelming him.

[Portable Full-Band Radio Signal Monitor]: Can monitor and locate radio signal sources in real time, with an effective range of 50 kilometers. Price: 50,000 System Coins.

[Miniature Historical Signal Residual Analyzer]: Detects and analyzes residual electromagnetic signals within a specified area over a past period. Price: 80,000 System Coins.

【Multi-functional Tactical Reconnaissance Drone (Stealth Version)】: Equipped with a high-precision camera and signal acquisition module... Price: Starting from 200,000 System Coins.

……

Li Zhenhua's mouth watered. If these high-tech devices could be brought out, it wouldn't be a problem to find an old radio station, but it might even be possible to uncover the entire underground enemy spy stronghold in Beijing.

But when he saw the long string of zeros that followed, he immediately deflated.

The three thousand system coins I have left are not even enough to cover a small portion of the total cost.

Moreover, many of these devices are quite large, and taking them out in this day and age would be too conspicuous.

Undeterred, he continued scrolling down, adding "price from low to high" as a filter option.

Most cheap items are toys that have little practical use or simple signal amplifiers.

Just as he was feeling somewhat disappointed and preparing to leave, an inconspicuous item caught his attention.

[Detector of Residual Signal from Old Radio Stations]

Product Description: The appearance mimics the bulky and clunky design of early 20th-century mobile phones, giving it a historical feel. Upon activation, it automatically detects residual signals from specific frequency bands left by radio transmitters that have been activated and used within the past month, within a 10-kilometer radius of the delivery point, and marks the signal source locations on its screen in the form of a grid map.

Price: 2,888 System Coins

The effect is to detect the location of radio stations within a 10-kilometer radius over a month...

Although the price almost emptied his current savings, it was just within his budget!

"This is it!"

Li Zhenhua felt a surge of excitement.

This thing is practically tailor-made for this case!

It avoids the problem of needing real-time monitoring, directly tracing the "historical records" of the past month, and its scope is more than enough to cover the entire steel rolling mill and surrounding area.

Although it's a bit pricey, as long as you can find the exact location, everything will be fine.

Without further hesitation, Li Zhenhua clicked to buy.

The system currency balance instantly shrank to 112 yuan.

At the same time, a heavy, substantial device resembling an old-fashioned "big brother" mobile phone appeared in the system space.

Li Zhenhua withdrew his consciousness from the system, feeling much more at ease.

Tomorrow, he will find an opportunity to bring this "old relic" to a central area of ​​the factory and start it up.

If that radio station has been turned on and broadcasting in the past month, we will definitely be able to find it!

Thinking about this, he felt much less pressure to solve the case within seven days.

The next morning, as dawn broke.

Li Zhenhua pushed his bicycle out of the courtyard, breathing in the crisp, cool air; the bruises on his face seemed to have faded somewhat.

He went to the familiar state-run breakfast stall at the alley entrance as usual, intending to have breakfast before going to the factory.

As soon as I entered the store, I heard a slightly slick voice greet me warmly.

"Oh! Section Chief Li! Good morning!"

Li Zhenhua looked in the direction of the sound and saw Xu Damao sitting at a table in the back, with douzhi (fermented mung bean juice) and jiaoquan (fried dough rings) in front of him, his face full of smiles, waving vigorously at him.

"Section Chief Li, there's a seat here! It's no fun eating alone, come on, let's share a table!"

As Xu Damao spoke, he pulled out an empty stool next to him.

Li Zhenhua found it a bit funny; Xu Damao was quite the social butterfly.

He didn't refuse, pushed his bicycle against the wall, and then went over and sat down.

Good morning, Comrade Xu Damao.

Li Zhenhua nodded.

"Oh dear, please don't call me 'comrade,' just call me Da Mao!"

Xu Damao was unusually attentive, moving closer, lowering his voice, and wearing a fawning smile.

"Section Chief Li, you really were something else that day!"

He secretly gave a thumbs up.

"I saw it with my own eyes! You sparred with that idiot Zhu and knocked him to the ground? That was so satisfying! You have no idea, that kid's always been a bully in the yard, only you can handle him! It was so enjoyable to watch!"

Li Zhenhua smiled but didn't respond to the question. He simply ordered breakfast from the waiter who came over.

Seeing that Li Zhenhua did not deny it, Xu Damao became even more enthusiastic and continued to flatter him.

"If you ask me, Section Chief Li, you're young and capable, and you're very skilled. You truly deserve the title of Security Section Chief! Unlike some others, hmph, they're all talk and no action. I'll need your help in the factory from now on!"

Breakfast was served quickly.

Xu Damao eagerly pushed the fried dough rings he had ordered toward Li Zhenhua.

"Section Chief Li, please try this, it tastes good."

Then he started rambling on about random things, talking about interesting things in the factory and courtyard. He flattered Li Zhenhua to the extreme, while occasionally making subtle remarks about Sha Zhu and Yi Zhonghai.

While eating, Li Zhenhua occasionally chimed in, thinking that although Xu Damao was slick, he was indeed quite funny and a "talent" at livening up the atmosphere.

When it was time to pay the bill after the meal, Xu Damao rushed out of his pocket, took out money and food coupons, and stuffed them into the waiter's hand without saying a word.

"No, no, I'll treat you! Section Chief Li, this meal has to be on me! Consider it a welcome dinner! Please don't stand on ceremony!"

Seeing his expression, Li Zhenhua knew that refusing would be pretentious, so he smiled and accepted it readily.

"Thank you, Comrade Damao."

"Oh, you're too kind! It's nothing, it's nothing!"

Xu Damao was overjoyed when he saw that Li Zhenhua did not refuse. He felt that the breakfast he had treated Li Zhenhua to was worthwhile, and that he had successfully established a connection with him.

The two walked out of the breakfast stall together and parted ways at the alley entrance.

Li Zhenhua got on his bicycle and slowly pedaled toward the steel rolling mill.

As soon as I arrived at the entrance of the security office building, I saw Lin Taotao already waiting there.

She changed into a neat casual outfit, which made her figure appear even more upright. She was looking down at a small notebook with a focused expression.

Hearing the bicycle bell, Lin Taotao looked up and saw Li Zhenhua, especially the bruises on his face that hadn't completely faded. Her lips twitched slightly, but she quickly regained her seriousness.