Convincing himself that what he and Kyungsoo had was just a teen age puppy love didn't seem to work out with Jongin,   especially when after four years,  

Kyungsoo is a radio DJ who gives pieces of advice to his callers about mending their broken hearts and how the world is such a crappy place to believe that there is thing called true love in relationships. For him, love is temporary. People come and go to your life and in the end they are all the same; they will leave you broken and tormented once you give your all. But what will happen when one night a single call will change his life?