Jung Ha Lin is just an average 18 years old high school girl. One day, she met the most annoying guy she has ever met, who turns out to be her beloved childhood friend. Slowly but surely, her past keeps coming back.. And everything starts to change, the truth is finally revealed, love is blossoming. 

'Cus you never know when something is about to happen 

Childhood: (Ha Lin's 7 years old, Jonghyun's 8 years old)

Jung Ha Lin and Kim Jonghyun grows in the same neighbourhood. They used to play together every afternoon. Their parents were close with each other, they (Ha Lin & Jonghyun) were also close with each other. One day, Ha Lin said that she really wanted a dog like Jonghyun's, but unfortunately her father doesn't allow her, so Jonghyun gave her a puppy when he's dog gave birth. But one day Jonghyun and his family have to move due to family business. And since that day they never see each other. ----So what will happen? Did she still kept the puppy? Will she remember him?

-additional info-

Key is your brother

Just for the sake of this story, Key's real name is not going to be Kim Kibum ,but Jung Kibum and Jonghyun is going to be younger than Key by a year.