Underdog (Korean: 언더독; RR: Eondeodog) is a 2018 South Korean animated film about the story of abandoned dogs. The film is directed by Lee Chun-baek and Oh Sung-yoon and stars Do Kyung-soo, Park So-dam and Park Chul-min. It was released in theaters on January 16, 2019.

The film opened the 22nd Bucheon International Fantastic Film Festival in July 2018.Tickets for the film were sold out in 9 seconds, setting a record for the shortest time for an opening film at the BIFAN to be sold in such time. It was also chosen to be screened in North Korea as the first act of the South Korea-North Korea film exchange program.

Underdog was featured in the Taiwanese Kaohsiung Film Festival in the Kids Fantasy section on October 20-21, 2018.

In March, 2019, Underdog was featured in Tokyo Anime Award Festival, being the first Korean film to do so. In June 2019, Underdog was featured in Annecy International Animated Film Festival, being the only Korean animation film out of eight to do so.

PLOT:
Stray dogs who have been abandoned by humans find a place without humans' and realize their identities and the meaning of freedom and self-identity.