Thank you for replying and your edit for the page. Also, sorry for not replying sooner. I wish to apologize for not giving more details on the specific part of the system example. It is not just in Chinese and Korean media but also for Japanese as well. There are some examples from Japanese media that can be seen on the page:
Death March's Protagonist is the only one who can use an RPG-like system that lets him store items, gain more skills, view his status, etc.
The New Gate's protagonist can access an MMORPG-like system much like the game he was in before being transported to another. The inhabitants can't access such a feature.
World Customize Creator's protagonist has a Divine Art that allows him to customize anything through windows that pop up like in a game. This power is unique to him compared to others who may have their own Divine Arts.
In Reborn as a Vending Machine, I Now Wander the Dungeon, The vending machine protagonist has access to a system that allows him to customize and upgrade what products he sells but in exchange for money.
Another example that I have found but haven't posted is called Goshujinsama to Yuku Isekai Survival, where this protagonist can call upon a crafting system that is oddly similar to Minecraft or other games in the genre.
Another Japanese Isekai is called I'm Standing on 1,000,000 Lives. The characters each have access to an RPG-like system that provides them skills, weapons, leveling up, revival, etc.
If we look at Korean media, we can see two examples;
One is already on the page called I am the Sorcerer King, where the protagonist is a reincarnated archmage on Earth being ravaged by monsters, but people known as Awakened can fight them due to using an RPG-like system called the Akasha System.
Another is called Latna Saga: Survival of a Sword King, where people from Earth are each given their own personal system called a Guideline which functions like an RPG where they are giving skills, magic, and classes leveling up. Unfortunately, the main character is giving a defective one where he can't advance like other people. The inhabitants of the world don't have Guidelines thus are weaker compared to people who have one.
These are just ones that I could find, but there might be more out there. I am sorry for how long this reply is, but I don't know a better way to make a convincing argument. I hope that this helps with understanding what I mean where the System point can be more general rather than just being found in Chinese novels and manhua. Also, I agree that it should be time for a mod to do an edit pass, but they are most likely busy with spammers to do that.