After their parents suddenly pass away, nineteen-year-old Lin Wanxing painfully gives up her admission to a prestigious university and takes a factory job to raise her three younger brothers on her own. The brothers hide her admission notice, carrying guilt in their hearts for years. Five years later, all three gain admission to top universities and confess the secret they kept back then, insisting on making it up to their sister. Lin Wanxing lets go of her regret over not pursuing higher education and opens a free village reading room at home. The siblings stay by one another's side, conveying the warmth of the eldest sister as a mother and the deep bond between siblings.