Homeless on the streets of Kuala Lumpur, Hsiao Kang is robbed, beaten and left for dead; he is found and nursed by Rawang, an immigrant worker, who lives in the shell of a modernist building abandoned during construction. Rawang's feelings for his patient may or may not be sexual, but there's definitely something like lust in the eyes of Chyi, a waitress in a run-down old coffee shop, when they light upon the recovering Hsiao Kang. And so a triangle forms as a blanket of noxious fog settles on the city and everyone has trouble breathing.