Twenty-five years after Hong Kong's return to China, the story revolves around a struggling family as a microcosm of society. Police officer Ye Guodong (played by Chan Shan Chung) was appointed as the flag-raiser for the July 1 return celebration, but he injured his arm before going on stage and was unable to perform his flag-raising duties. Coincidentally, his wife Sun Zhuolan (played by Natalie Tong) gave birth to their son Jialiang (played by Zhu Minhan) on the return day, making up for his inner regret. A few years after the return, Hong Kong has experienced ups and downs. When SARS hit in 2003, Zhuolan gave birth to a young daughter, Jiawen (played by Liu Yingqi), and the family faced the challenge. Time flies. When Jialiang grew up, he encountered riots while backpacking. Fortunately, the country protected him in times of crisis. Seeing the national flag flying, Jialiang aspired to become a policeman to protect Hong Kong, and he also hoped to fulfill his father's wish as the flag-raiser that year...