Un cero a la izquierda literally translates to "a zero on the left". It's a fantastic Spanish idiom used to describe feeling worthless or insignificant.
Just like how a zero placed to the left of a number (e.g., 07) has no value, the singer feels completely unimportant without his love. He sings "soy un cero a la izquierda" (I'm a nobody) to express the depth of his sadness and how the breakup has shattered his sense of self-worth.
Faltas Tú is Morat’s bittersweet postcard from the edge of a breakup. With playful comparisons—“a galaxy without stars,” “a shoe without its sock”—the Colombian pop band paints how utterly incomplete life feels when that special someone is gone. Every party is pointless, every street sounds empty, and even the simplest outing “tastes like nothing” because her absence has turned the singer into “a zero on the left,” an expression in Spanish for feeling useless.
Yet beneath the self-deprecating humor and raw frustration, there’s stubborn hope. He keeps most of her messages, refuses to be “the loser who doesn’t insist,” and clings to the belief that she is “one in a million” who will eventually return. The song swings between resignation and resolve, capturing heartbreak’s exhausting loop: missing, remembering, resisting, and—above all—waiting for the day when she’s back and life can finally run at 100 percent again.