The lazy and carefree Boasting Hui (played by Chow Yun-fat) agreed to temporarily take care of Li Yang (played by Ke Weilin), the son of his former lover Li Xi (played by Anita Yuen), for 100,000 yuan. Later, it was discovered that the son was his biological son and had autism. From then on, his life changed. When the relationship between father and son grew stronger, the news of Li Xi's death came. Brother Hui decided to take on the responsibility of being a father and take his son to a new page in life.