My Grandson is the Villain, and I'm His System

As a webnovel author, I transmigrated... into my own book. The catch? I'm not the hero, nor the villain, but the dead soul of a cannon-fodder villain's long-lost ancestor! My descendant, Mo Qingkuang, is on the brink of utter ruin, destined to be crushed by the true protagonist, Lin Yang, wiping out our entire lineage and erasing me from existence. My very story, my life, hangs by this tenuous thread. Just as despair threatened to consume me, the 'Ancestor System' activated! My only path to resurrection requires a grim and audacious task: by guiding my disgraced descendant, I must systematically strip the chosen protagonist, Lin Yang, of his destiny, his legendary treasures, and even the precious revival materials meant for his 'Grandfather in the Ring'. Can this author-turned-ancestor lead his villainous grandson to defy all odds, usurp fate itself, and rise to supreme glory, or will the universe's preordained hero prove an insurmountable obstacle?