Cleveland (OH), US

A Chinese man was sitting in his office; he was one of the most renowned Doctors in the US if not the whole world. His expertise in medicines far surpassed any of his colleagues. While he worked as a heart specialist, his knowledge in every other field was also quite high. But there was a secret of his that he had kept from everyone, even his 4 wives and 28 girlfriends whom he loved dearly. Well, there were many other secrets he had kept from them, but this one was the most important one for him.

It was the Medicine King System, before he got the system, he was an orphan adopted by his uncle and harassed by every living relative. Only after he possessed the system did he find the vast world of medicines. Not only did he gain knowledge of all kinds of medicine and the ability to heal almost anyone, but he also received forbidden medicines that could temper the minds of people. Of course, he was a righteous individual who only used it on his enemies. Well, sometimes he did use them to escalate his relationship with a few of his lovers, but that's beside the point.

He had also found out that there exist supernatural things in this world and had been trying to ask his system to give him access to that.

He had gotten a Quest about 3 years ago to perform 10,000 operations and the reward was a martial medicine that could help him enhance his body beyond humanly possible heights. At first, he had started doing 10-20 operations a day, but he found out that only the operations that went successfully counted, after which he had been doing only a dozen operations every week.

He had only reached about 1800-something operations in these 3 years. But now he found something extraordinary. His system had shown a pop-up notification. It was quite unexpected since most of the time a loli AI would tell him about everything the system shows and even explain it to him, but she was nowhere to be found.

Medicine King System has discovered a dead system Core in one of your patients who passed away. After carefully analyzing and deciphering it, Medicine King System has cracked it and built a special plugin that will help you acquire many different resources or services.

Would you like to install the plugin?

Yes

No

He immediately clicked yes, this was a great opportunity for him. After all, for three years, he hadn't progressed at all, but now he understood that this was his chance. He was thinking of maybe killing more patients so he could extract more cores. But he knew if he did that, his new lover would definitely not like it, she's also a doctor who's working with him so she'll know immediately.

Plugin Installing...

Suddenly a loli came into his view.

"Host, what happened just now? Even as the System AI, I don't have the authority to see it; what is going on?"

After he explained everything she didn't know what to do.

"I do know there are other systems and that Systems have cores but how did this system use it? I don't understand it."

"Maybe because you're too young; let daddy make you a woman first, and then you'll understand."

"For the last time, host, I'm an AI, you can't pound anything and everything you see."

While the benter between AI and a human was going on, another system user faced something similar.

Katerini, Greece

Lex Foster was a Young European man who had come to Greece because of his interest in Greek Mythology. While visiting various places, he came across many wonderful things and places, but the most interesting thing happened when he picked up a marble that fell from the Statue of Poseidon in a temple. He didn't know what it was but still picked it up but as soon as he did it vanished.

After which he had gotten a system. It took him a lot of time to take in everything and understand that gods truly did exist, and this System was for the inheritance of Poseidon.

It had been 2 months since that event. While he had come into contact with some people who call themselves mages, he had also found out more about Mist World. After all, he himself had become part of this Mist World.

Now, because of the system, he had been spending his time mostly in the ocean. But he had to come to land when he received a Quest to break a specific statue of Athena. He didn't know why the sudden quest, but his knowledge of Greek Mythology told him it was probably because of the grudge between Poseidon and Athena.

The reward for this Quest would be an Ancient Ship. He was looking forward to it a lot because of his senses in the sea. You see. He had been going out in the sea these days and had been activating a function of his System a lot but couldn't do anything.

He has a function in his system that can detect treasure in the Sea. The problem was that he didn't have his own ship. The further you go from the mainland, the better the treasure, and to go far deep, he needs a ship. He could obviously tell someone about it, but it'll definitely bite him back. However, with this Ancient ship, which needed no crew to sail, he could reach anywhere.

Thus he was in a hurry to complete this Quest.

As he was traveling through, he got a pop-up notification in his System.

Condition to Unlock Trading Function fulfilled. Please install the necessary plugin to start the Function.

[Install] [Cancel]

While usually, most functions he unlocks don't ask his permission, he didn't hesitate to press install as he understood if he could trade in the treasure he'd find anonymously, it'd definitely be way safer.

Chamber of Causality, Netherlands

You might be reading a pirated copy. Look for the official release to support the author.

Ethelreda Ring, also known as Witch of Calamity, was sitting in a specific room made to absorb the mana and transform it into a cell in one's body. The Chamber of Causality was a reward she had gotten centuries ago, but it was still useful to her nonetheless. She is quite famous among the Mist World as the oldest witch or ancient witch. Her magic far surpasses any other witch. There were very few people on earth who could fight her and still escape unscathed; thus, even though she had offended many people, hardly anyone bothered her as she tried to create a complete mana body.

She had not yet forgotten about the existence of her System, even though it's been a couple of centuries since she had seen any change in it. After all, if not for the True Witch System, let alone Tier-10, she wouldn't even be able to reach Tier-2.

Around 1400 years ago, when she first got it, she had shaken up the complete structure of Earth's hierarchy; people saw her doing near-impossible things like they were nothing but simple actions to her.

From a Tier-1 witch whom they could kill, she had become a Tier-8 witch who could destroy countries in just 2 years. If not for the powerful people at higher tiers, she might even have become the Overlord of Earth. Alas, even today, when she was already reaching the peak of Tier 10, the only place she controlled was Europe.

Just as she finished, she noticed a notification in her system.

Finding New Feature…

Checking Energy Requirements…

Connecting to Origin…

[Trading Plugin] found.

Would you like to install it?

Y/N

She was quite suspicious, being this old she knew that suddenly getting something for free is always a scam. But she also trusted her System as it had saved her from any illusions or mind control, meaning this message is genuine and from her system.

However, considering she had never dealt with the keywords plugin, energy requirements, or origin, it was quite complicated.

She wanted to say no, but the temptation of a way to fasten the process or just some help of some kind of artifact was quite high.

In the end, she chose to believe in herself and accept it. She was, after all, one of the most powerful beings on Earth; even if there's some problem, she can surely solve it.

Thus all three contenders whom Harsh sent the plugin request accepted it.

Back at Harsh's house, he was playing chess online and destroying noobs. He was, after all, a Grandmaster in chess. While without practice, his rating had reduced by a lot and he can't compete against GMs right now, but that doesn't mean he can't crush some 1600-1800 rated players.

Since he had found out that the Task that the system gave him didn't have any time limit, he also understood that if someone just chose to ignore the notification, he'd never complete the Task.

But to his surprise, he got a notification just after two hours.

Beginner Task Completed:

Reward: Beginner Package (E)

• Successfully Made all three Hosts install the plugin.

Reward Upgraded: Beginner Package (B)

• Successfully made a Client 10 Tiers above you.

Reward Upgraded: Beginner Package (SS)

• Successfully did the task without leaking out the existence of The Universal Trading System.

Reward Upgraded: Beginner Package (SSS+)

You've become the official Holder of the Universal Trading System.

He immediately opened the package.

You've Opened the Beginner Package (SSS+)

Received:

Traveling Shop

Fog of Mystery

1 × True Path Card

1 × Spectacles of True Sight

System Skill: Appraise Item (SSS+)

System Skill: Container (SSS+)

Host Skill: True Appraisal

System Skill: Translation (SSS+)

1 × Trader's Coat

3 × Recruitment Letters

2 × Security Guard (++)

1 × Golden Coin

1 × Display Shop

5000 × Trading Points

Since there were a lot of things, he started reading Descriptions for them one by one.

Travelling Shop: A shop that travels across the universe randomly. The shop will allow you to have clients outside of System Hosts/Holders. The Shop will stay at a fixed place for one day, and any client can enter it again if they wish to by activating a Card they will get by using any of the services.

Fog of Mystery: A Mysterious Fog that you can use to shroud the Travelling Shop. The Fog will hide any and all secrets. Inside the Fog of Mystery, no items/skills/ laws related to identification/ Appraisal/ analysis can be used other than by the Owner of the Fog.

Note: To show the authenticity of Trading, the Fog of Mystery will not shroud any Goods being Traded.

True Path Card: There are many paths to get stronger. Helps you find paths that may suit you.

Spectacles of True Sight: Spectacles of True Sight are designed to see through illusions and can help reduce damage from psychic attacks.

System Skill: Appraise Item (SSS+): A system Skill that can help you appraise items. A Trader must know the value of what they're trading.

System Skill: Container (SSS+): Many things that are sold can be dangerous or maybe the environment can be dangerous for the things. Using this Skill, you can contain such items.

Host Skill: True Appraisal: Knowing your client is knowing their needs and knowing their needs is the most crucial step of a successful trade. Can give detailed information of any living being up to or below your Tier. Moderate information about someone up to Two tiers above you and Minimum Information up to 12 Tiers above your own Tier.

System Skill: Translation (SSS+): If you can't communicate, you can not seal any deal. Helps you understand any language you may not know.

Trader's Coat: A Trader needs a unique brand for themselves. This Coat makes you seem friendly yet professional. Helps hide all emotions. A Trader can never show surprise, you'll never be surprised as long as you wear this Coat.

Recruitment Letters: You can't always do everything yourself. Use a recruitment letter to hire people.

Security Guard (++): Security is a must when you deal with valuables. These Anasain Golems can be used as a tireless force to always provide security. For your own security, however, they can not be operated on higher power than you can Control. Their Tier will lock at 2 Tiers above you.

Golden Coin: A coin to flip. Trading can also involve bets; however, as after a particular point, you can easily predict the outcome of a coin flip, it's not possible. This Golden Coin can not be predicted by any Law. The coin is separated from Fate.

Display Shop: A Shop to display items. You can put any items you have in it to be sold or buy/rent things from the System to put on the shelves.

Trading Points: There are many currencies that are used across the universe. To make it easier for you, the Trading System converts any currency to Trading Points without any fee and can convert it to any currency by paying a small fee.