Lee Changsub ends his military service being a completely different person from when he enlisted.

That guy is long gone.
And he has lost the reason he ever wanted to end his service when he finds out why his fiancé cut all their connections all of a sudden.

Park Chorong dreams to get her thoughts out there with the songs she writes, if only she could find the right singer. She believes success is the sweetest revenge to people who looked down on her.

So when she hears Lee Changsub singing. She knows he's the one. The right one to sing her songs. The right person to entrust her thoughts with and she will work with him no matter what.

Two broken hearts.
One frustrated singer.
One frustrated song writer.
One dream.

Will they be able to form a melody together?