Park Jiyeon, a girl who got into SM Entertainment & become an SM Rookies. One day, she had to live in younger SR15B's dorm (Jisung, Jeno, Jaemin, Donghyuk, Mark) for a while until her debut. After, living with the guys, she started to have feelings for that guy. Will there be romance? Who is it? Cr. @momo_yehet07