Xia Yingyue - a girl who treats the world indifferently and hurts herself;
Yi Cheng'er - a cheerful but nervous girl;
Luochen Miao - a girl with a double personality but extremely naive;
Ximan'er - a careless girl who smiles like a red apple.
A story of youth, the confusion, incomprehension, and contradictions of four girls as they grew up; the choice between love and friendship...
{Why are we so hurt}