Leo : A well-known idol and a  member of the kings of concepts VIXX 

N + Ken + Ravi + Hongbin + Hyuk : VIXX members 

YoonA : A surgeon doctor in Seoul Hospital 

Seohyun : Yoona's colleague from another department and her best friend 

Teaser : "Doctor, he fainted during his daily practice..... plz don't tell anyone that he's here so his fans won't freak out. I hope you could corporate"