Buwan was released in 2018 by Juan Karlos, the Filipino band fronted by singer Juan Karlos Labajo, and quickly became one of the most recognizable OPM ballads of recent years. Written as a love song addressed to the moon, it spread through radio, streaming and live performances before finding a second life in short clips online. Fans continue to reuse its chorus and gentle instrumentation for romantic edits and tributes, keeping the song present long after its original chart run in the Philippines and among Filipino listeners worldwide.