They made a promise when they were children. Shortly after they are forced apart. Reuniting years later in university should have been a happy time. But who is the new exchange student and how will their arrival affect these childhood friends and the promises they made in the past?

Luhan and Xiumin welcomed their teenage foster son Sehun into their home one year ago and after a shaky start have been living in almost domestic bliss.  When Luhan hears about another young boy in need of a foster home urgently they welcome another teenager into their home, but this time it's going to be anything but blissful. 

"You write such great, powerful songs.  Seven albums worth, all having gone platinum."  Kris leaned forward on his elbows, bringing himself closer to his star.  "One measly love song.  Is it so much to ask?"  "I will not have smushy love-sick rot on my album!" Teeth bared, the Korean was formiddable as he leaned across the desk, almost nose to nose with his manager.  "I won't sing it!"