Su Tang temporarily lives in his sister Ai Xian's apartment due to family changes. There are three sisters in the apartment. The sharp-tongued Ai Xian, the gentle and playful Lin Yi, and the cute and innocent art student Bai Lu. Although the three of them had their own attitudes at first, they were gradually impressed by Su Tang's well-behaved and sensible nature. The daily quarrels and complaints, the patient guidance in study, and the meticulous care in life. Su Tang grew up happily and healthily amid laughter, playfulness and gentle company.
