Taeyeon would go up to the rooftop of their house at night to voice her frustrations out. She didn't know that someone from the next rooftop was listening.

After a tragic event from her past which made her an orphan, Taeyeon grew up to be an introvert, only relying on herself despite her classmates and relatives bringing her down. She only relied on 1 specific object to find her direction in life. One day, she met a girl who made her feel the love deprived from her all these years.  Is she willing to give up her heart's desires in order to fulfill and make up for a promise in her past?