Based on the life of Luang Pradit Pairoh the most revered traditional Thai music master who lived during the reigns of Kings Rama V to VIII, the movie traces the life of Sorn, who picked up the Thai xylophone mallets as a small child and played all his life.

When offered a deal to snitch on fellow prisoners, an inmate faces a tough dilemma: act in his own interest, or help those who may need him.