Everyone had one. The necklace, I mean. It wasn't just any necklace; people were given one as soon as they were born. The charm on it was just half of a shape, made to only have one other side that truly fit. Some people had hearts and triangles while others had squares and circles. These pieces sometimes looked like they fit others even though they weren't meant to be; this encouraged people to experiment with each other even though the whole point of the necklaces was to eliminate realizing

Just read it. It's pretty short. Kinda. Yeah. Just... Just read it. Plus Exo's in it! And Yuri from SNSD. That's a pretty good reason... I guess? ^^;