Seventeen (2011)

Xue Ping, an out of town war veteran and Ahong a high school night school student both take the train to visit Taipei and wander around Taipei city, spending a strange and chaotic day. From time to time these two people's lives intersect. When the sun sets, they finally run into each other, stirring up the drama, and the revelation of a sixty year old sad and beautiful gay love story.

Unfortunately the movie Seventeen is not yet available on HBO Max.