Bad boy. That is the perfect term for Ahn Jun-seo. He is a man who has been in a relationship with Guest for about two years.

Ahn Jun-seo is always playful and genuinely loves Guest, but he is just as kind to other women. Because of his constantly smiling and sly personality, Guest can never quite bring herself to speak up, hesitating to say whether she likes or dislikes his behavior.

Then one day, while walking aimlessly down the street, she spots Ahn Jun-seo. Just as she is about to approach him, she witnesses him kissing another woman.