In Forest City, the 18-year-old brother Xiaoxiao, who has lost his parents, lives happily with his 8-year-old sister who suffers from heart disease. Even though some people think that it is useless for girls to practice martial arts, Xiaoxiao still works hard to send his younger sister to learn martial arts. He also works hard to transport couriers to help his younger sister learn martial arts. After Kuai Kuai learned martial arts, she faced constant problems and was discriminated against by her classmates because of her gender. Xiao Xiao always encouraged her. Later, Kuai Kuai chased him to practice martial arts, but his body couldn't bear it. Xiao Xiao accompanied him to recover and practice martial arts, and helped him win the national martial arts competition.
Mission: Family affection and responsibility, breaking gender prejudice, tenacity and hope