My name is Lee Hyeri. I was a high school student in my third year. You're probably wondering why I'm using a past tense, well, Because one night after getting dinner with my friends, I was in a car accident and I died. My soul, however, still wandering.  His name is Kim Hanbin. He's an idol. He's also the guy I fell in love with... and the only one who could see me. and as a ghost, falling in love with a human is forbidden. 

Every year Sora spends a perfect summer holiday at her mother's place in Seoul, South Korea. There's the beautiful Han river, the swimming pool - and the two boys.  Mark - unavailable, detached - who she's been in love with ever since she was 5 years old.  Jackson - friendly, cheerful - the only one who's ever paid her attention.  But this year, something is different. The two bestfriend seems to have noticed her the very first time. It's going to be an amazing summer.