A pair of sisters.
Because her mother was abducted by human traffickers, strong sulfuric acid was injected into her knee joints on her way home, and she eventually died. Her father became mentally disturbed after his wife was murdered.
One of the two sisters was given to her aunt to raise, and the other lived with her father.
Two different childhood lives, two different educational backgrounds, formed two different life realities...
One embarks on a tireless road to study, and the other falls into the world of mortals and never looks back.