This handsome boy is Tanner Gerschick, a professional model from United States. He is really famous now in Taiwan since he is the male star in the famous Taiwanese singer Jolin Tsai's new music video (you can see it here and below), released a few days ago.
I spotted Tanner near Zhongshan MRT, he said he likes this area a lot because it is full of small shops, cafeterias, etc. He was wearing a white shirt, a vest with tropical print, light denim 3/4 length trousers and brown leather sandals. The vest and the sandals are from Bisou Bisou, both Tanner and I agree that it is one of the best stores in Taipei (you can check their website here).