I lived in Japan for a couple years and I hated oolong when I first tried it but over several months grew to love it. Nowadays, over the summer, I make cold brew oolong. I make 1-2 liter batches at a time in glass bottles and then drink it over several days. It is very refreshing over ice.
I spent a few weeks there about a decade ago, loved the architecture of the city and the landscape. Plus the Vietnamese people were warm and welcoming. Hoping to go back to that part of the world again someday.
Did you take this picture? I love it by the way, good colors and feels like a candid slice of life there, captures that moment well.