Yoon Seo and Yoongi have been best friends for 5 years. She loves him more than anything and can never say no to him. Realizing that she has fallen in love with him, she's confused to whether tell him or not. But all goes down the hill when he shows up with his girlfriend, unannounced. Will her crush for him be hidden forever? Will he see her more than his best friend someday? Will it be the same forever?