Roque , 28 years old from Fuencarral , Madrid is in a limit situation only a year after winning the world record and the gold medal in the 100 meters freestyle at the 2020 Tokyo Olympics . His life seems to be ruined and he is desperate. As he finishes yet another day of training, he recalls the letter he has always wanted to write underwater.
| Actor | Role |
|---|---|
 Fernando ValdivielsoRoque Adult | Roque Adult |
 Miquel InsúaBraulio | Braulio |
 Luisa GavasaVioleta | Violeta |
 Álvaro LarránNot listed | Not listed |
 Óscar SinelaNot listed | Not listed |
| DDiego BergmannNot listed | Not listed |