Gao and his friends are the happiest kids in the city of Galilee. Living on the rooftops of this bustling metropolis, sometimes life can be tough – but they still churn out songs all day, and dance under the stars at night. But when Gao meets his dream girl, a billboard beauty named Sian, fate takes him on a wild ride through romance, friendship, and gang rivalry, all told through enchanting melodies and stunning dance numbers.