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Modern pharmacist Lyndwell (Lyndwell) traveled to the world of the next generation of "Harry Potter" due to an experiment explosion, and became a mysterious girl with **blue eyes and white hair**. After being brought back to Spider-End Alley by Snape in the name of "guardianship", she used modern scientific thinking to subvert the traditional potions science in the wizarding world, and gradually became a bond that he could not let go from being a despised "burden".
At Hogwarts, she was both an outlier in Slytherin - using chemical formulas to deconstruct the principles of potions, and the source of the butterfly effect: secretly protecting Harry but not daring to change major events, until she discovered that her time travel was actually related to an experiment in Snape's boyhood. And that man who always used his poisonous tongue to cover up his concern would hold her frozen hand when her magic power was rioting, would sneak into the Black Lake as a "hostage" when she replaced Cedric as a warrior, and even sacrifice half of her magic power to her after the war, leaving a trace of his black color on her white hair forever.
From the 11-year-old adopted daughter to the potion innovator standing side by side, from "Professor Snape" to the trembling "Severus", this development game across time and space finally cracked the unfinished sentence "Always... For whom?" On the title page of the textbook "Half-Blood Prince".
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Intention: None yet