The Courtyard House: The story begins with He Yuzhu beating up the White Widow.

Xu Damao said with a hint of schadenfreude, "Brother Zhu, if you wear a police uniform tomorrow morning and walk past the Yan family's gate, I reckon that old bastard Yan Bugui will be scared to death."

He Yuzhu said, "What's the use of scaring him?! People like the Yan family, you can't scare them no matter what. The best way to deal with this kind of person is to make them pay money."

Xu Xiaoling said, "Teacher Yan is notoriously stingy at school. He'd rather die than part with his money. Getting him to pay up won't be easy."

He Yuzhu said with a smile, "The rumors started from their family. Once we find the evidence, they'll have no choice but to pay compensation."

Xu Damao said, "Brother Zhu, this kind of evidence won't be easy to find."

He Yuzhu said, "It's not easy for you to find one. But for me, it's a piece of cake!" He then asked, "I heard your dad is planning to have you learn to drive?!"

"Okay!" Xu Damao responded, and said, "My dad told me that he would find me a mentor after I graduate from high school."

He Yuzhu cautioned, "Da Mao, I know you're quick-witted. But some things can't be done too soon. Otherwise, you might enjoy yourself for a while, but regret it for the rest of your life."

Xu Damao was taken aback by He Yuzhu's ambiguous words. After a while, Xu Damao couldn't help but ask, "Brother Zhu, what exactly did you mean by that just now?!"

He Yuzhu smiled and said, "I met a guy from Northeast China a few days ago. I heard from him that Zhao Shufen is pregnant."

"Zhao Shufen?!" Xu Damao muttered, then, recalling He Yuzhu's earlier words, he instantly realized and asked, "Brother Zhu, is Zhao Shufen really pregnant?!"

He Yuzhu nodded and said, "Zhao Shufen is doing quite well back at her parents' home. Although her nephews and nieces treat her well, the child is still a worry for her. Her brother has a junior fellow apprentice who, right after liberation, had a difficult childbirth that resulted in the death of both mother and child. He never married. Her brother thought this junior fellow apprentice was a good person. They were about the same age, so he played matchmaker for them. And now, she's pregnant."

Xu Damao said, "Everyone used to say that Yi Zhonghai couldn't have children. I didn't believe it. I thought infertility was a woman's problem. I never imagined it had anything to do with men?!"

He Yuzhu said, "Having a child is a matter for two people, but the choice of whether to have a boy or a girl is in the man's hands. So some mothers-in-law complain that their daughters-in-law can't give birth to a son, which is all nonsense! It's clearly their sons who are incapable. If they don't believe me, they can go to the hospital and ask the doctor."

They ate and chatted, and soon the roast chicken and ribs were all devoured by He Yuzhu and his three companions. After finishing, Xu Damao volunteered to clean up the mess and then took Xu Xiaoling back home. He Yushui went back to her room to read. He Yuzhu lay on his bed, his consciousness entering his spatial dimension. Lately, He Yuzhu had been feeling uneasy, as if something special was about to happen.

"Ding!" Just as He Yuzhu was checking the contents of the containers in his spatial storage, the system activation notification sounded in his ear. He Yuzhu was slightly taken aback, thinking to himself, "Didn't that greyhound already run away?!"

"Congratulations, host. You have passed the platform's review. You have completed the side quest: Changing He Yushui's life, and the hidden quest: He Daqing's return and the destruction of the retirement group. Reward: Interdimensional Trading System." After a slight pause, before He Yuzhu could react, the system's voice rang out again: "Special space detected in the host. The Interdimensional Trading System has merged with the space."

"Integration complete! Main system stripped away again!"

"Holy crap! What's going on?!" A series of question marks appeared on He Yuzhu's forehead. After a while, He Yuzhu came to his senses and quickly got out of bed. He locked the door from the inside and drew the curtains. Then, He Yuzhu entered the space. The space had completely changed. The original containers had become shelves. The items from the containers were now arranged according to their categories on the shelves. There was also an altar-like structure in the space. He Yuzhu, as if possessed, walked onto the altar. At that moment, a familiar yet unfamiliar girl's voice rang in He Yuzhu's ears: "Interdimensional Trading System activated. Importing transaction information."

"M187 Galaxy, Blue Planet, as a thank you gift, seeking to purchase pollution-free food."

"S318 Galaxy, Tianyu Star, Gaoyou, seeking to purchase martial arts manuals."

"K912 Galaxy, Blackstone Star, Budame, looking to buy water."

He Yuzhu was completely dumbfounded when three transaction messages suddenly popped into his mind. While he was still stunned, some operational information from the interdimensional trading system appeared in his mind. He Yuzhu muttered to himself, "Could it be that the system I was initially matched with was a growth-type system?!"

The Interdimensional Trading System is currently a basic trading system, in its trial period. It requires 100 transactions to fully activate. 1000 transactions upgrade it to a basic system; 10,000 transactions upgrade it to an intermediate system; and 100,000 transactions upgrade it to an advanced system. During the trial period, the system provides three new transaction records per month. At the basic system level, it provides five new transaction records per month. With each subsequent level upgrade, five more transaction records are added per month. The Interdimensional Trading System includes a built-in address book function. Each new trading partner is automatically entered for easy retrieval by the host.

With a try-it-and-see attitude, He Yuzhu connected with Gao You from Tianyu Star: "This is He Yuzhu from Earth Star. What kind of martial arts technique do you want?!"

"Hello! I am Gao You from Tianyu Star. What martial arts skills do you possess?!"

He Yuzhu paused for a few seconds, then asked some questions he wanted to know. It turned out that Tianyu Star was similar to a high-martial arts world in novels. This world had originally developed much like ours. However, after a total lunar eclipse, what they called the Dark Gate was opened. Demonic energy revived, and animals began to evolve. Initially, firearms could eliminate the mutated animals, but as time went on, firearms became ineffective. At the same time, some martial arts masters developed battle qi within their bodies. This so-called battle qi was somewhat similar to internal energy cultivation. When battle qi was cultivated to a certain level, combined with martial arts skills, it could kill the mutated animals that firearms could not eliminate.

Now that he knew what the other party needed, He Yuzhu had a better idea of ​​what to offer and asked directly, "What are you going to trade with me?!"

Now it was Gao You's turn to be stunned. After a long while, Gao You asked, "What do you want?!"

He Yuzhu thought for a moment and said, "Before the Dark Gate opened, what stage of technological development had your side reached?!"