Bugging My Way into Taming a Yandere Boy Servant

[Transmigrate into a book + obsessive, scheming yandere + master and servant + split personality + interstellar + intense push and pull + happy ending] Clear-headed, composed heroine vs. a yandere boy with a split personality According to the rule that anyone who falls off a cliff and survives is bound to find a secret manual, You Ran transmigrated into a book after falling off one, and was bound to a System. The System came with a Buddha-like sound effect. Its voice drifted calmly as it told her she had become the book’s wicked supporting female character, who tormented the protagonists mercilessly in the early chapters, only to be tormented by them in turn later on. [Oh, right. The male lead is an artificial human created by humans. He can’t die, and you’re his master. Host, don’t you dare go soft on him. Just follow the story and torment him properly, and you’ll wake up from your vegetative state!] The System told her with a beaming smile. To wake up, You Ran began a life of treating the male lead like dirt. But “My master must have hit me because I did something wrong!” “My master must have her reasons for doing this!” “I’m sorry, Master. I was wrong. Please punish me!” The pretty young boy knelt on one knee before her, gazing at her without so much as a blink. Her: ??? Who the hell could bring themselves to lay a hand on him?! But gradually, You Ran discovered that this little fellow had another side he kept hidden. Blood stained the boy’s clothes, and the dagger in his hand glinted coldly in the moonlight. He looked at her with languid amusement. “I’m terribly sorry, my master, that you had to see me looking so filthy.” It turned out the male lead had a split personality! One was an innocent, lively little ray of sunshine; the other, an elegant, cold-hearted yandere. The heroine is clear-eyed and driven, balancing strength with gentleness without being a do-gooder. The female lead in the book is also career-focused, neither a white lotus nor a scheming green tea.