Zhang Pan came to Beijing from a third-tier city with a vision of city life. Unable to find a good job, she started as a nanny. However, Zhang Na felt unprecedented despair when the landlord called her again and again to urge her to pay the rent. Looking at her basement of less than 20 square meters, she shed tears and decided to embark on another path. Her younger brother came to live with her. Through the crack of the door, he saw his sister's survival skills in Beijing...