Joseph Zhang warns his disciple, Eric, about repairing the machine before his retirement. Eric ignores his warning and causes the machine to break. Joseph joins Infinity Machinery Factory after his retirement and earns the company's trust by solving many machinery problems. Apex Machinery Factory is in trouble after Eric manages the machines and goes bankrupt. Joseph returns to the company as a shareholder and works with Zach Zhao to lead it back to glory. He enjoys a perfect retirement life.