Jongwoon and Jungsoo once lived a happy existence. They had a good couple years together, lived together, loved each other, and screwed each other's brains out, whenever the mood struck them.

And they continued like that for so long, ignoring the fact that Jungsoo was immortal and Jongwoon was merely mortal and would eventually die. Jungsoo just never thought that day would come. He thought he and Jongwoon would continue on together forever, or the equivalent of forever in human years.

He was proven wrong when Jongwoon died (or did he?) and Heechul came along.