A necklace that can tell you who to love and who to live with forever.

Songjin and many other people of the world have a special necklace. This necklace is very important to everyone because it tells them when their soul mate is close, but Songji has to overcome many obstacles to be able to be with her soul mate. Nari, on the other hand, doesn't care about the necklace and her one motive is to not let Songji ever be with her soul mate.