There are many things we are helpless about, we can only watch as time bleaches our hair.
In fact, Old Master Zhang understands very well that he is no longer in any position to interfere in the family matters between his grandson and granddaughter-in-law. He also knows that everyone needs to grow, and only through continuous growth can one's life become meaningful. Initially, one's growth may bring many painful memories, but these will eventually become the most beautiful memories in a person's heart. No matter what career one eventually chooses or experiences, every choice will make one happy for their past efforts, leaving no regrets.
