After I Transmigrated into a Book, the Yandere Male Lead Showered Me with Affection

[System + transmigrate into a book + mind reading + sweet romance + devoted couple]

Xu Qingwan, heir to a medical tradition, discovers that she has transmigrated into a book and become a female guard in a prince’s manor. She thinks that if she completes the System’s missions and quickly follows the plot, she’ll be able to return to her original world.

But she never expects the story to go completely off the rails.

Why is the prince, who should be doting on the heroine and deeply in love with her, flirting with Xu Qingwan and showering her with affection?

Why has the heroine, who should fall in love with the prince at first sight, become sisters with Xu Qingwan instead, and the two of them are inseparable?

Mission after mission is completed, and Xu Qingwan, the prince’s personal female guard, finds herself sinking deeper and deeper.

She’s in danger. It seems the obsessive prince has her completely under his thumb.