Sunggyu and his girlfriend were a happy couple. They fought a lot, but that only made their relationship stronger. 

But.....

What happens when his girlfriend suddenly leaves him forever?

Will Sunggyu be able to cope without her in his life?

What happens when he finds a blue box his girlfriend left for him?

Can he move on with his life?

What will he do to get rid of the pain in his heart?

Read to find out.