Huai Nian Describes It

When she was young, her sister's disappearance changed her temperament drastically. She was helpless and could only secretly vow to be admitted to Fengli University. In high school, a boy let her out, but he betrayed her because of money. In the charming eyes of college, a boy actually claimed that he had a girlfriend who was exactly like her, but she had disappeared. What the hell is going on? Where did my sister disappear again? Peeling away the fog, will she and him have a good ending...