Santiago, 2006. A student revolution is brewing in the streets while reggaeton beats pulse in the clubs. Amidst this backdrop, Antonia (15), the only child of a single mother, can't shake the excitement of the upcoming school trip to Argentina. However, her anticipation is clouded by uncertainty—she needs her absent father's authorization to go, a man she's never met. Mariana (45), her loving and devoted mother, unexpectedly refuses to assist, prompting Antonia to embark on a clandestine quest. As tensions rise at school and Antonia seeks solace in parties and the streets, the bond between mother and daughter begins to fray.

Despite numerous setbacks in her search for her father, Antonia's focus shifts when she discovers Tamara (17), her half-sister. With Tamara's support and affectionate sisterhood, Antonia finally locates Juan Antonio (50), her father. His presence not only grants her the authorization she sought but also unexpectedly brings a newfound family connection: a sister and the certainty that her identity is deeply rooted in her relationship with her mother.