Synopsis：Li Tao is an ordinary delivery man. At forty, he has a nine-year-old son whose mental age is only that of a four-year-old. His greatest wish is for his son to live a normal life like other children. With this dream, Li Tao participates in an online live-stream show called "Boxing Challenge." The show's rules stipulate that if an ordinary person, after three months of boxing training, can last 12 rounds in the ring against a designated professional boxer, they will win a 200,000 yuan dream prize. At the age of forty, Li Tao resolutely decides to take on the challenge. What follows are immense difficulties: he is already forty, has never been in boxing, faces doubts from those around him, rejection from boxing gyms, and mockery from others. Can he persevere? Can he fulfill his wish? The arduous journey of a small person's dream is all in "Dad Stands Up!"