On March 30, 1999, the filmmaker's late father, who worked far from home as a factory security guard in Dongguan, had sent his very last letter to his family. He dies of an accident a few days later being only 36 years old. His son remembers him learning Cantonese, hoping to stand a chance of landing a job in Guangdong. In 2020, he will turn 36 himself. Carrying his father’s last letter, he returned to where he lived before his death (Duangguan). He divides his message into 36 segments and invites 36 security guards who work in the city to teach him how to read them in Cantonese.