"Just because I smile, it doesn't mean I'm happy. Because it takes just one smile to cover a million tears." M ACADEMY's most popular girl, SuYeon, hides a very dark secret, she smiles a lot to cover up her pain. Until one day, Yoo Kihyun transfers to the school and accidentally he finds out....her secret. Slowly, he inches his way into her life. But is his presence enough to change her? Read to find out :P