Donghae doesn't know which screw came loose in his head that day he clicked on an ad and accidentally became the 12-day boyfriend of a cute boy with silver hair. He is even more surprised to find out that the deal wasn't a simple week-and-a-half period of time, but to meet the other on the 14th of each month for a whole year! 

And so, maybe because he can't take the blinding light radiating from other couples anymore, or maybe because the boy—Hyukjae—is really too cute to reject, the story of how two boys fall irrevocably in love starts to unravel... all from just a click on a phoney internet ad.