Kim Jongin and Han Sojin are bestfriends. They've known each other for years. 

Best friend, they said. Friendship line will always be there. And none of them wants to break it.

Best friend, they said. But how long they will be able to keep everything up before time and fate tear them apart?

There they are, walking in two different ways while looking at the same sky, with the same heart-breaking stories.