After people died, we have a ceremony in every year.
It's called 제사 and we set a few things in 제사. One of that is 병풍, the screen(the word in translation) and 향, the insense. People think there may be the spirit of died peopld behind the screen and we do formal things to hornor the death.
So 병풍 뒤에 향냄새 맡는다 includes meaning that you are gonna die.
For example, 병풍 뒤에 향냄새 맡고싶어? means would you like to be died?. The expression is just metaphor.
If you don't get what I'm saying and want it be clear,
You can google 제사 and see some images :)