This is a spin-off (I don't know if that's the most appropriate word, but it's the only one I can think of that sort of fits) of my story Bleeding Love: Stupid Cliches.  

(And Bleeding Love: Stupid Cliches is a companion piece to Bleeding Love: Stupid Questions.  While this is a spin-off that's centered in the happenings of the second universe, Stupid Cliches, it would be beneficial to read the stories in order... starting with Stupid Questions, then Stupid Cliches, and finally this one.)

The story's about Mark meeting Youngjae when he's at a low point and how Youngjae brings sunlight back into Mark's life.