"California Dreamin'" by the Mamas and the Papas. You will fall in love with that song (if you haven't already) after watching this movie. Two stories, entangling into one; both about Hong Kong policemen falling in love with mysterious women. It was recommended by my friend after I said I loved Frances Ha. I don't know whether you can call this as offbeat romance.. but to me it was, and it's well worth the watch.