Jin Xiaobei, twenty-five years old, an administrator at a small company. With a monthly salary of six thousand, she rents a fifteen-hundred-yuan single room in an urban village and takes a forty-minute subway commute to work every day. She is neither ugly nor stupid, but her eyes are forever glued to her phone screen, watching vlogs of refined girls' days like two transparent walls, trapping her in the middle and making it hard for her to breathe.