After star forward Yoon Hong-dae pokes an intrusive reporter in the eye for questioning him about his fugitive mother's real estate scam, he is suspended. His agency assigns him to coach the homeless national team for the Homeless World Cup in Budapest as a PR move before transitioning into acting. Producer Lee So-min is hired to direct a documentary, deliberately selecting players based on tragic backstories rather than athletic skills.
The roster includes Kim Hwan-dong (a bankrupted businessman estranged from his family), Jeon Hyo-bong (a devoted father wishing to look strong for his daughter in Australia), Son Beom-soo (seeking redemption to win the affection of a disabled woman), and Kim In-sun (a traumatized mute youth grieving his lost friend). Hong-dae initially treats the role as a chore, but after defending the squad against street harassers, he rejects a lucrative variety TV offer to accompany them to Budapest.
At the tournament, the team suffers a harsh 12–0 defeat against Costa Rica. In their brutal final match against Germany, several Korean players are injured. When their goalkeeper is hurt and no substitutes remain, an injured player hobbles into the goal box. Hong-dae encourages the team simply to run until the end. Moved by their resilience, the international crowd begins chanting for Korea. In the final moments, In-sun scores a single goal through disciplined teamwork, securing a profound moral victory despite losing the match.
The team finishes last in the standings but earns the Best Newcomer Trophy. Returning to Seoul, Hwan-dong reconnects with his daughter, Hyo-bong maintains contact with his child, and In-sun secures stable work. Hong-dae returns to professional soccer with renewed purpose, scoring a goal in a professional match as So-min smiles while filming him from the stands.