[2] Ching Fai (Nick Cheung) is a former boxing champion who has struggled since his glory days, having gone to prison over involvement with the Triads due to financial problems and now working as a taxi driver.

When Triad loan sharks torch his taxi and chase him down for money he owed, Fai decides to flee to Macau to avoid them.

In Macau, Fai accepts a job offer from an old friend to work as an assistant in a gym, while renting a room with a feisty young girl Peidan (Crystal Lee), who has been taking care of her psychologically unstable mother (Mei Ting) since her four-year-old son drowned and her husband left her for another woman.

At the gym, Fai meets a young man, Lin Siqi (Eddie Peng) who wishes to learn Mixed Martial Arts in order to join an upcoming MMA tournament, the "Golden Rumble", which offers the winner millions of dollars - his motivation for doing so is to help out his father, a businessman who had recently lost a fortune due to a failed "flipping" deal, which has turned him into a depressed drunkard.

[2] Clarence Tsui of The Hollywood Reporter writes, "It’s this mix of tears and laughter amidst the blood, sweat and broken necks that makes Unbeatable an enjoyable vehicle.

"[7] Kevin Ma of LoveHKFilm states that "with a career-best performance by Nick Cheung, a script infused with great humor and MMA scenes that will please action fanboys, this sports drama is Dante Lam’s best film since The Beast Stalker and easily his most purely enjoyable to date.

He informs audiences that "Unbeatable’s selling point is mixed martial arts, but it’s really a character-driven drama about three troubled souls in Macau," using the words "uplifting" and "inspiring" to describe the film.