Chu Qinghuang transmigrates into the body of a concubine-born daughter of the Prime Minister's household who drowned. The moment she opens her eyes, she's in hell mode.
Her legitimate older sister sneers, holding up a "secret letter of treason": "You'd better confess, little sister!"
Chu Qinghuang whips up a revealing solution on the spot, turning the secret letter into a love letter before everyone's eyes. "Should I tell everyone about your secret meetings with the hostage prince from the enemy kingdom?"
A modern laboratory hums to life in her mind. Gunpowder formulas help control floods, and a microscope reveals poisonous insects.
Then the Imperial Preceptor pins her to an altar. "The Demon Star brings calamity upon the world. It must be destroyed!"
King Yan, Xiao Jue, storms the altar with his troops. Blood drips from his sword as he smiles at her. "How did the concubine-born girl I married become a Demon Star bent on destroying the world?"
Later, on the night the Imperial Preceptor activates the Seven-Star Blood Array, she tosses out a chemical formula and smiles. "Before you seize the throne, shouldn't you learn your redox reactions, senior?"
The plot deviated a bit from the original intention of the heroine