When Song Areum is sent to give her classmate the work he missed but on the way there gets attacked by one gang and is saved by BTS, the gang her classmate is in. Word gets out that BTS is protecting a girl and now she's being targeted by their rival gangs.

A now she's living with them because it's their fault she's fallen into this dangerous situation.

Yet as each day passes with BTS, secrets get revealed. BTS slowly grows to love Areum, only to have her ripped away by GOT7. And then, her missing brother comes into the picture.