When Katong's mother loses the family's boxing gym in a gambling bet, Katong (Judy Ann Santos) is poised to get it back by fighting in a boxing with the very man who won the bet. With no training at all, Katong recruits her ex-boyfriend, Paul (Piolo Pascual), because he's the best boxing trainer who might help her get her family business back. "Bakit 'Di Totohanin" is a Star Cinema film.