Kim Jongin, a policeman of the Gangnam District, has accidentally shot an innocent bystander in the process of catching a criminal. Out of remorse, he visits the victim everyday for a week. 

Inspired by exciting adventures, this story follows the main character, Joy, as she navigates the world with her newfound friend, Sungjae, using a mysterious planner and its clues to continue the adventure. Its setting and plotlines follow a mostly fictional approach, but there are a couple realistic touches as well.      [SPOILER] For those who still don't understand the story:  

**Written in first-person. You and Jaehyun were friends before his debut and when both of you meet again at one of his concerts, old memories come back.