Transmigrated into the Parasite in the Crown Prince's Heart, I Can't Escape

[Historical romance + transmigrate into a book + shared-heart gu + yandere crown prince + sweet and angsty + mutual salvation + no saintly heroine] The moment Jiang Nianzhi opened her eyes, she had become the human Host of the poisonous gu tumor in the crown prince's heart. Crown Prince Xiao Yanji was born with a parasitic gu in his heart. The venomous gu was sentient and took human form as her. She and the crown prince shared one heart When she was happy, his heart raced; when she was sad, his chest tightened in pain; when she tried to run, he suffered a heart attack. On her first day in this world, she took off running. Xiao Yanji clutched his chest and vomited three pints of blood, leaving every imperial physician on their knees. She was carried back to the Eastern Palace, bound hand and foot. The crown prince, pale-faced, grabbed her wrist and pressed it to his chest. “Every step you take makes it crack a little more. Want to see how many steps I can manage?” In tears, she promised never to run again. But when she had a nightmare, the crown prince woke in the night with palpitations; When she sneaked spicy food, the crown prince's tongue went numb during a meeting; When she blushed reading a romance novel, the crown prince turned red in front of everyone in the Golden Hall. The court officials were baffled. “Your Highness, are you all right?” Xiao Yanji replied expressionlessly, “I'm fine.” Then he went back and confiscated all her romance novels, along with her snacks. Jiang Nianzhi was furious. “You control the whole world, and now you want to control what I read?!” Xiao Yanji lowered his eyes to look at her, the tips of his ears turning red. “…I feel everything you read.” Jiang Nianzhi: “…” She thought she was just a poison in his heart, destined to be removed sooner or later. She didn't know that this possessive crown prince had already locked her, along with that poisoned heart, away in the deepest part of himself He didn't want the poison cured. He wanted her.