Park Kyung was a dilligent student and a nice kid. He always cheerful and smilling everyday. Kyung always kind to everyone and greet them everyday . 

Until one day he lost his smile, and everyone arround him getting worried. When someone ask him, he always said "i'm fine" and give a big smile. Maybe he is smilling wide but his smile was different, his smile looks fake and full of pain. Even their family doesn't know why.

He still become a good kid but his act was different from before. Kyung still kind but his smile or his big eyes look empty and sometime his eyes full with sadness. One of his friends is worried and trying to find an answer.

Zico was a friends of kyung, and one day after school he seen kyung with a sad face and puffy eyes on empty classroom. Kyung silently cried by himself and when Zico trying to look after his little fellow, he was suprised with something he seen.