His chances of receiving a life-saving heart transplant thwarted when terrorists take over the hospital where the operation was scheduled to take place, a frail Muay Thai student finds his odds of living lifted when his friends decide to take on the bad guys single-handedly. Wun may be small, but he packs a hearty punch. And the same can be said for his friends, too. Now Wun is sick, and he won't survive unless he gets a new heart. Incredibly, Wun's best friend discovers that a local hospital has just received a viable heart via organ donation. But Won's only got four hours to live, and when terrorists storm the hospital it starts to look like all hope is lost. Fortunately Won's friends aren't willing to let their pal die without a fight, and before long this pint-sized wrecking crew is taking out terrorists by the dozen so the doctors will be able to operate.