He guarded her for thirty years, only to be paid back with the words "I don't love you." Shen Yan is reborn back to the year 1993, returning to the very day his marriage with Su Ning began. In his previous life, he propped up the family for her, guarded the factory for the Su family, and exhausted half his life, only to watch with his own eyes as she chose someone else. Living a new life once more, he no longer humbly curries favor, takes the initiative to propose a divorce, and turns away to leave this warmth-free marriage. After leaving Su Ning, Shen Yan arrives at the southern suburb branch factory, resolves production crises with superb technical skills, but unexpectedly gets embroiled in missing blueprints and equipment accidents, being framed by his former competitor. Facing all the skepticism, he reverses the situation with his strength and evidence, making everyone see true capability clearly.