Dear diary..   All this while, I've been living my life peacefully. Go to school, make lots of friends, study hard, score perfect marks for every tests. And finally graduated. It was so peaceful. But, I never thought that this will happen to me.

What happens if you arrive at the Scarlet heart set? Meeting everyone and you finally meet the one. Your bestfriend IU drags you to the set to meet her collegues. But you meet him and your world changed. Dangerous memories start to stir... Who is he and what am i to him? You are a famous solo artist in the industry. You have fun and you compose music. But your life feels empty.. What is it?