Xu Xu was selected by the System to complete missions in countless small worlds, playing one obsessive supporting female character after another who loves the male lead without being loved in return and ends up ruining her own life.
Because Xu Xu's acting was so good, the System decided to let her play the female lead.
The System didn't know that Xu Xu wasn't acting well. She was simply playing herself.
System: You're going to a tragic romance world. As long as you follow the plot and remain tolerant, generous, and kind, the male lead will love you for the rest of your lives after putting you through physical and emotional torment.
Xu Xu, smiling: I love the male lead more than anything.
Some time later
System: How did you turn the male lead into this?
Xu Xu: He wants me to obey him in everything, but he doesn't listen either. Look how well-behaved he is now. Don't worry, I'll make sure we get a happy ending.
First world: Captivity and counter-captivity
Second world: Want to abandon your wife and child? Then I'll clip your wings.
Third world: You think I'm your substitute? That's fine. You're just one of many substitutes for me, too.
Theme: A satisfying power fantasy