I Transmigrated into a Male-Oriented Novel and Stole the Hero’s Harem

Liu Yan transmigrates into the “fiancee who breaks off the engagement” in a male-oriented novel she had read. Outraged by the male lead's fickle ways, she resolves to help all the female leads escape his control. The one Liu Yan feels most sorry for is the male lead's master: originally a sexless mermaid, she is forced by the novel's plot and the male lead's protagonist aura to become an intellectual big sister. So Liu Yan keeps snatching the male lead's opportunities, fighting monsters, and leveling up.

Later, she realizes the plot is going off the rails. Why have you been reborn, male lead?

Why are all the girls so possessive of me?

Huh? Master, why have you transformed again?

Watching the man who had just transformed, Liu Yan fights the urge to pin herself against the wall and realizes she has taken things too far...

The story follows the female lead as she saves the female leads in a male-oriented novel and falls in love with her master. It also has a slight ensemble-cast feel.