The last few days of summer were expected all thanks to a head injury that Yeo Na couldn't even remember how she got. Now that her memory is messed up life has officially reached it's peak in being the most difficult, but to help out the gentle giant from next door, Wooseok, gets very close to Yeo Na. What happens when a little someone from her summer shows up trying to get her back? Will she remember that he's bad news and listen to advice of friends? Will she fall in love with him all over again or stay with her gentle giant?