When Chanyeol's boyfriend falls ill with a mysterious man-made disease and the government doesn't do enough to find the terrorist, he sets out to fight the creator for the cure himself. Fighting by his side is less-than-badass Baekhyun and his wife, military extraordinaire Sookyung.  

Chanyeol, a washed up pianist and child prodigy, longs to revive his genius with a new sonata, to be performed with the accompaniment of a ballerino. When he appeals for a dancer to perform alongside him, Kim Jongin, professional ballerino with the Paris Opera Ballet who longs to break free of background roles, answers the call.

Sehun and Chanyeol fight but they also kiss and make up.