When Jiang Yu transmigrated into the Qingyun Sect, the original story had already reached the point where the original host had placed a love spell on Cheng Bing, the coldest, most aloof senior sister in the sect.
There was no need to explain what a love spell was.
Jiang Yu: Don't come near me!
Cheng Bing's eyes darkened. “...Isn't this exactly what you wanted?”
Theme: The heroine admits her mistake and changes her ways, avoiding a groveling-after-the-breakup arc!