There are diary pages for fifteen days - from the full moon to New Year's Day.  A love story through pages in a diary of friends who had turned to lovers in their last days together.

Vernon has admired his classmate for four years.  Even though Seungkwan never knew him, Vernon promised to be the one for Seungkwan. "No matter what happens, I promise [that] I'll be by your side"

Seungkwan works at his father's fishing company.  Hansol comes over to get a part time job.  After a sum of years, they become lovers.  However, one day when they're out in the water they never return.  Their story does not end there, however.   

Seungkwan is a part-time worker over at the corner bakery and Hansol is a college graduate who works in an office. Seungkwan can't ever get anyone to watch Friday night soccer games with him.  Keeping his lonely tradition up, he goes to the market to get some chili sauce for his chips.  When he reaches for the jar, a hand absentmindedly holds his hand. 

A relaxation establishment is supposed to be a place where you wind down and forget about the stress of your everyday life.  Choi Hansol has a hard time relaxing when he hears another person crying their eyes out every day.  But sadly, he cannot do a thing about it.  One day Hansol decides to finally break into the room.  He finds something that the clinic manager said he wouldn't want to see.