Troubled and alone, a boxer moves in with his long-lost mother and autistic pianist brother — but must fit in with a family he hasn't known for years.
You can now watch Keys to the Heart online on the following streaming providers in the United States.
| Directing | Kerwin Go | Director |
| Writing | Choi Sung-hyun | Writer |
| Directing | Relyn A. Tan | First Assistant Director |
| Production | Carlo Lopez | Associate Producer |
| Directing | Miguel Vasquez | Second Assistant Director |
| Crew | Miguel Vasquez | Stunt Coordinator |
| Production | Joenel Canaria | Production Manager |
| Art | Erik Manalo | Production Design |
| Costume & Make-Up | Archie Baraceros | Makeup Artist |
| Costume & Make-Up | Jacky Pante | Makeup Artist |
| Sound | Emilio Bien A. Sparks | Sound Designer |
| Sound | Nicole Rosacay | Sound Designer |
| Sound | Francis de Veyra | Music Director |
| Editing | Mark Cyril Bautista | Editor |
| Editing | Aaron Alegre | Editor |
| Camera | Peter Frac | Director of Photography |
| Production | Stacey Bascon | Supervising Producer |
| Production | June Torrejon-Rufino | Supervising Producer |
| Production | Michaela Reyes | Supervising Producer |
| Writing | Pamela Miras | Screenplay |
| Production | Veronique del Rosario-Corpus | Producer |
| Production | Vincent del Rosario III | Producer |
| Production | Valerie Sandoval Del Rosario | Producer |
| Production | Ronald Monteverde | Executive Producer |
| Production | Erik Matti | Executive Producer |
| Production | BJ Song | Executive Producer |
| Production | Vic del Rosario Jr. | Executive Producer |
| Sound | Wolfgang Amadeus Mozart | Music |
| Sound | Sergei Prokofiev | Music |
| Sound | Erik Satie | Music |
| Sound | Johann Sebastian Bach | Music |
| Sound | Léo Delibes | Music |
| Sound | Franz Liszt | Music |
| Sound | Claude Debussy | Music |
| Sound | Nikolai Rimsky-Korsakov | Music |
| Sound | Pyotr Ilyich Tchaikovsky | Music |
| Sound | Frédéric Chopin | Music |
| Sound | Modeste Moussorgsky | Music |
| Sound | Jim Paredes | Songs |