Hilary Amanda Park is about to confess her feelings with her first love on the third day of the first month of summer when she saw him kissing another girl. It breaks her heart into a million pieces and swears that she won't love the same man again. To mend her broken heart, she tried boys so that she can forget her first love pero paano niya makakalimutan ang lalaki kung kapatid ito ng pinakamalapit niyang kaibigan?