Yun Zhaozhao transmigrates into a book as a cannon-fodder character and gets bound to the male-oriented System, "Supreme Above All."
Every day, it's ordered to "build a career and vie for supremacy over the Six Realms," and told that a companion will join it on the path to the summit.
Just as Yun Zhaozhao finally decides to build an empire after being coaxed by the System every day, the System falls in love.
The male-oriented System falls head over heels for the female-oriented System, "True Love Above All." Now it spends every day slacking off and dating, leaving all its missions to autopilot.
With the System neglecting her, Yun Zhaozhao looks left and right and decides that Lin Yuan, the original author who transmigrated into the book alongside her, must be her destined partner. After all, this guy is bound to the female-oriented System, "True Love Above All," and spends every day chasing people around to play matchmaker. He looks like the perfect complement to her!
The "companion" the System hinted at is crouching in a corner, waiting for her to team up with him. But she mistakes him for the villain and kills him with one slash!
Only when Yun Zhaozhao stands there with a bloodstained blade and sees the mission panel announce "[Mistakenly Killed an Ally] Mission Failed" does she finally realize what happened.
The male-oriented System is honeymooning with the female-oriented System, and she's been screwed over.
Su Qing's death meal was secretly delivered by the female-oriented System, and she's become a tool.
And the real master of career-building turns out to be the matchmaker System that keeps saying, "The world is full of love!"
At the end, the System asks her, "Going back to the modern world?"
Yun Zhaozhao looks at all the "mistaken kill" achievements she's earned and the bonds she's made in this other world, then raises an eyebrow and smiles.
"Thanks for asking, but I can't bear to leave this lousy Six Realms."