Esfumado means “vanished” or “faded away,” evoking something disappearing like smoke. In the song, “Lo que un día construimos se ha esfumado” describes a shared relationship and its memories slipping away, making this a vivid and emotionally memorable word.
Virlán García sings about a relationship that has already ended, and he says so in the first line: "Esta historia terminó, no existe" (This story is over, it doesn't exist). What is left is the thing the two of them built, "Lo que un día construimos se ha esfumado" (What we once built has vanished), and a partner who is gone but still feels close: "eres un fantasma conmigo caminando" (you are a ghost walking beside me).
He refuses to treat the breakup as wasted time. "No creas que no valió la pena" (Don't think it wasn't worth it) is repeated, and he admits "Yo no aprendí a dejarte ir" (I never learned to let you go), calling her "una apuesta de largo plazo" (a long-term bet). The chorus holds both ideas at once: "Lo que construimos se acabó" (What we built is over), yet "Fue solo nuestro" (It was ours alone), until "Se lo lleva el viento" (the wind carries it away).