I Know Dark Magic from Saint of Light

[Western fantasy + pure love 1v1 + female protagonist + micro group portrait + female protagonist slightly sick and controlling] When she was seven years old, she was sent to a human experiment base by her biological parents. The men in white coats used her to test potions, record data, and study her like a guinea pig. The only people who are kind to her are a group of "patients" who also want to expose the truth. So she spent thirty years personally developing a virus that would destroy the world. When the monster swallowed her up, she was smiling - the world could finally bury her with her. But God did not allow her to die. Kyushu Tiandao exhausted her origin and sent her to a new world called "Sveta". Promise that she will have parents who truly love her and a normal life. She didn't believe it. Her heart had long since dried up. Until the woman hugged her and cried so hard that she was shaking and said, "Mom will never let you out of sight again"; until the majestic father knelt down and said awkwardly, "Hello, Serafina, I am your father"; until the brother who had never met wrote a letter and said, "Of course my sister is the best." Maybe this time, it can really be different. But she carries two missions, light and darkness When she was five years old, she met someone. He gently held her hand after she was exposed to the darkness: "No matter what you do, I will stand by your side. Not because I agree with what you do, but because you are you." She does not believe in the God of Light. God never showed up when she was in the most pain. But that person showed up. So she lowered her head slightly, bowed her head to him, and regarded him as her only god.