I moved back to LA in 2016 for the third time in my life; I miss New England but I have a similar melancholy there. Not completely the weather but the long cold winters did not help my mood much.
Do you want to go back and live in HK one day? I will probably go back to Maine at some point in my life because most of my family is there and I want to be with my parents more when they are older.
I dont think I would, to be honest, it's very difficult to feel like I can uproot more and more. Culturally, and friends-wise, and job-wise, etc.
HK is such a concrete jungle, and I have gotten to appreciate living in a less metropolitan place in Melbourne. I used to think apartment living was the best thing ever, but now I have a backyard and I dont think I can go back living in a shoebox again XD