Somos los mejores (We r the Best) by Luis Soto Muñoz

Isabel, the host of a late-night radio show, has spent years carrying the loss of Guillermo, one of her two sons. Withdrawn from the world, her only ties are her nighttime listeners and Álex, her eldest, who one day invites her into the virtual world he once shared with his brother. Among forgotten builds and pixelated memories, Isabel discovers that this place holds an unexpected way of facing absence.