Seohyun is the maknae and lead vocalist of snsd. Chanyeol is the main rapper and vocalist and the happy virus of Exo-K. He have a crush on Seohyun but Seohyun never knew and she always think of him like a hoobae and sunbae relationship. What will happened when Chanyel confess to Seohyun? What if she take that as a joke not real? What happened if Chanyeol got into an accident?