Brother and sister are deeply in love.

Family moral suspense shorts tell us that a brother from an early age is disciplined from a younger sister, and every time she makes a mistake, she goes hand-to-hand, and as they grow up, the sister begins to make a deliberate mistake, trying to draw his brother's attention to treason, a conflict after school, which has strained and complicated normal brother-sister relations, and then, by accident, parents find out that the secret of the brother-sister's and sister's private life is something that they're hiding from each other, and in the face of their parents' questioning, the sister finally confesss a long history of harsh discipline, a formal outbreak of family boundaries, growing up pressure and personal trust.