Can a Proper System Have a Mary Sue Storyline?

Zhi Xi had known for a long time that something was off.

She was the apple of the Zhi family's eye, a heaven-blessed beauty in Klan. Her figure, looks, intelligence, and soul were all top-tier.

And Ming Ke didn't like her?

Then the System appeared, and the truth came out.

The world she lived in was actually an erotic novel, and one with a reverse harem, no less. Ming Ke was one of the men in that harem.

The female lead's origins were even more extraordinary: she was the daughter of the heroine of another erotic novel in the same author's series. Among her mother's many suitors was Zhi Xi's own father.

Zhi Xi's mother was a supporting female character. Zhi Xi was a supporting female character. Even Zhi Xi's cousin was a supporting female character in another book by the same author.

Three supporting characters in one family. Zhi Xi couldn't help laughing...

In the original story, she would grow jealous and keep making trouble for the male and female leads, only to be humiliated over and over. In the end, her family would be destroyed and she would lose everything.

But the System said that once she bonded with it, she could change this ending. All Zhi Xi had to do was complete missions with it, change the reverse-harem ending, and create a wholesome, positive world.

The System insisted it was a proper System. As it watched the plot turn increasingly bizarre and the male characters cling stubbornly to its Host, it hurriedly sent a report to the main world:

[Can a proper System have a Mary Sue, too?]

*Just as the title says, this is a Mary Sue story.

*Sadly, it's 1v1.

*The main male lead will appear a little later.

*But a character could still end up becoming the love interest.

*Ensemble cast

Premise: There are no protagonists in the world; everyone is the protagonist.