Ningxin's friends all know that she is a perfectionist who will only be satisfied when everything is flawless. When she was in school, she would only be satisfied if her test scores were above eighty points; the house had to be spotless and orderly for her to sleep - if there was a small black spot on the white wall, Ningxin would rather stay awake all night to get white paint to cover the black spot; the food had to be visually appealing, aromatic, and flavorful for Ningxin to pick up her chopsticks; and when going out, if the taxi wasn't clean or tidy enough, or the driver looked unpleasant, Ningxin would refuse to get in the car.