William, a five-year-old boy, loses his innocence while helping his uncle Gustavo organize an orchestra with several friends.
| Actor | Role |
|---|---|
 Robinson DíazTío Gustavo | Tío Gustavo |
| FFelipe Rubio LuceroWilliam | William |
 Andrea GuzmánJazmín | Jazmín |
| JJorge BarónComo el mismo | Como el mismo |
 Álvaro BayonaGerardo | Gerardo |
 Diego CadavidJosé | José |
 Enrique CarriazoWilliam adulto | William adulto |
| JJulio CorrealMiguel | Miguel |
 Jorge HerreraAntonio | Antonio |
 Luz Stella LuengasGilma | Gilma |
 Julio César LunaAntulio | Antulio |
| MMiguel OsorioArmando | Armando |
| DDaniel RochaGermán | Germán |
| MMarco Ignacio RodríguezRoberto | Roberto |
 Nórida RodríguezMiriam | Miriam |
 Álvaro RodríguezNicolás | Nicolás |
 Diego VásquezCarmelo | Carmelo |