Cao Yan, a sideline child who was forgotten by the family, returned to the Cao family's old house with a warm-hearted appearance after his mother died of illness, trying to take back everything that should belong to him from his selfish and indifferent relatives. On the surface, he is gentle and modest, but in reality, he is deeply scheming and careful at every step. When everyone thought he was a chess piece at the mercy of others, he had already laid a dragnet on the chessboard. Starting from the fight for the inheritance of an old house, Cao Yan used his identity as a "filial son and virtuous grandson" to draw his greedy uncle, hypocritical cousin, and calculating aunt into the game one by one. He is holding a seemingly inconspicuous "heirloom" in his hand - a yellowed "Cao Family Instructions", from which he can glimpse the wealth and secrets of the Cao family that have been buried underground for hundreds of years. As the old house was renovated, a series of deliberately concealed past events surfaced. Cao Yan discovered that his mother's death was no accident, and that this family game was far more bloody than he imagined. He used "love" as a sword and "profit" as bait to stir up disputes among relatives with ease. He also acted as a savior at the right time, gradually gaining the right to speak in the Cao family. But when the secret door deep in the cellar of the old house was opened, Cao Yan realized that he had walked into a power puzzle that spanned decades, and that every move he made was secretly fueled by someone.
