Missing a sound of London

Recently, just before returning to Taiwan, I noticed the beauty of birds' chirps from the flat I lived in London. They were very clear and crispy. From the texture of the sounds, I could also feel the freshness of the surrounded air. I enjoyed listening to them when I got up, when I studied and when I was about to go to bed.
In my flat in Taipei, I can hear birds chirping, too. Comparing to the people living in the Taipei city centre, I am very fortunate to have these sounds around. However, after so many years of loving everything about Taiwan and complaining everything about London, I begin to feel dissatisfied with the birds' chirps in Taipei! I am surprised by my feeling but really, it is how I feel now! When being in the flat of Taipei, I feel sounds of birds' chirps are not so clear and crispy as those of London. As the flat in Taipei is much bigger than the one in London, the chirps of Taipei birds are not so close to me either. The air in Taipei... bears so much noises-- it is polluted.
Since when my feelings of Taipei and London have changed? Why do I miss London so soon? What happened to me? Am I ready to settle down in the UK?

Taiwanese opera

A few days ago, I went to a local restaurant with my family. When I was eating, I suddenly heard a familiar tune of Taiwanese opera. It was the owner of the restaurant watching TV.
I used to hear this tune of Taiwanese opera often when I was little. After so many years, the programme is still shown during the dinner time. I suddenly realise that the combination of hearing the tune of Taiwanese opera and having dinner is a sense of nostalgia to me!