Shanghai, 1935. The beautiful young girl Xiao Hong is a singer at a teahouse. She falls in love with her neighbor, a handsome young musician called Xiao Chen. Their windows face each other, and Xiao Chen often entertains Xiao Hong with magic tricks through the window. When Xiao Hong discovers that her boss indends to sell her to a rich teahouse customer who has taken a liking to her, Xiao Chen and his eccentric bunch of friends do all they can to stop it.