Shin is a morning person. It's still early morning, but he's already awake, just like any other day. But there is something extraordinary that happened to him this morning. When he opens his eyes, he finds that he is not sleeping alone. There is a beautiful girl sleeping in his arms, Song Hyang. Shin can't get the situation right away. He needs to blink his eyes multiple times to understand his current condition. He's never been in any relationship before and has never had any skinship with any girl in the world except his relative. But yet, that morning, he finds himself sleeping with a girl who is about the same age as his little sister, if she is still alive. He feels like a pedophile. Hyang is only a teen and he's almost reached his thirties this year. Is he dreaming right now?