Kim Taehyung is a popular student in Gyeomsujeong High. He's well known for his cute boxy smile, cute personality and stunning visuals. He always laugh like there's no tomorrow. He always smile like he never had a problem. But behind those smiles is a world of pain. No one knows. No one knows his pain. No one knows the million tears he release every night alone in his room. No one knows how problematic he is. Until this guy Jeon Jungkook came. Did he came to change Taehyung's life? Did he came to help him? Or did he came to make the situation worst? "Behind those pretty smiles is a world of pain... I know..."