Junior H taught himself guitar and accordion off YouTube while working the kitchen at a Wendy's in Utah, where his family had moved in 2015 from Cerano, Guanajuato. Born Antonio Herrera Pérez in 2001, he uploaded his own songs under the name until one of them, "No Eh Cambiado", passed two million views and convinced him to make a career of it. The debut album Mi Vida en un Cigarro arrived in 2019.
He writes sad music, mostly: heartbreak over sierreño guitars, the corner of corridos tumbados people call urban sierreño. $ad Boyz 4 Life II (2023) reached number 14 on the Billboard 200 carrying no guest features at all, and produced "Y Lloro" and "Las Noches". Away from his own records he sings on "El Azul" with Peso Pluma, and on "Lady Gaga" with Peso Pluma and Gabito Ballesteros, which entered Hot Latin Songs at number one. In February 2026 he and songwriter Gael Valenzuela released the joint album DEPR</3$$ED MFKZ, a number one on Billboard's Top Regional Mexican Albums chart.