Solar is a talented and well-known singer plagued by personal demons that she struggles to overcome; Byulyi is a gifted musician ready to give up her singer dream after facing many rejections. After the two accidentally meet and start a seemingly perfect relationship, Byulyi's career also takes off with Solar's help. However, their relationship becomes strained and they soon realize that sometimes, love might not be enough. 

Solar was trying to be the perfect girlfriend, but sometimes things just don't go the way she wants it to.

The typical moonsun set up where they are both hurting each other but are too stubborn to do anything about it. You already know it.

Byulyi and Yongsun make a pact that if at 29 and 30 they have not fallen in love or is not in a committed relationship with another, they will marry each other.

Byulyi has never said no to Yongsun, but Yongsun couldn't do the same. A story about the truth of every relationship.