Those photos were taken in Hanoi the first day of the Tet which is the celebration of the lunar new year in some of south asian countries. In Hanoi, The Tet period can be felt as a boring and melancholy city for some people, the grey bad weather is spreading over the region and a part of the hanoian population leave the city for few days (generally countryside citizens and foreigners). Hanoi for few days become a "ghost" town unlike usual days, however this year, Hanoi shows us a new face with the sun back which bring more life in here.
Happy lunar cat new year.
PS: You can check out the serie on clicking visit the website.