Sunmi, a girl who is 19 going to 20, mets Topp Dogg unexpectedly and now she's out of her mind because of them. Her mom want her to become a choreographers for Topp Dogg and help them become more popular.  But after they left, everything got out of control and the only one who can fix it is SunMi.

(also onwattpad, except wattpad is more updated)