Based on a famous Hong Kong’s urban legend, Ciao, UFO tells the coming-of-age tale of four childhood friends, living in Wah-Fu Estate in the golden 80s. After witnessing a mysterious extra-terrestrial event, their life was changed drastically, drifting away from each other. Years later the friends, now in their late twenties, each struggling with life, must once again face the past event, as well as to seek the bond between them.