He accompanied him out for a walk. He doesn't know, he just randomly wanted to and he knew when the other had pulled him out the house to watch the snowflakes fall. They were both wearing scarves and coats and lots and lots of them, perfect enough for the winter air that welcomed them as they exited the house.

 

He watched as he put his left hand out to catch the snowflakes while the other remained entwined with his. He could never trade places with anyone in this world, he swears. That smile...that smile that he adores...he could never, and unconsciously, he does too- smile in his own thoughts and maybe literally, too. 

 

The other gasps, satisfied with what he's seen and turns around saying, "I've seen them all but pass me by, and only you stayed."

 

The latter was talking about his previous sad, sad life, walking alone the streets with thousands and possibly millions of people passing him by. Only that Yoochun...Yoochun took him and stayed.