When you're Rap Monster's little sister, things can get a bit hectic. Kim In-hye moved to America to avoid her brother's fans, but has returned to Korea for college. When she finds out her parents are away for vacation, she has to move in with her brother and his friends. In-hye must learn how to clean after her brother who destroys everything he touches, decipher the ways of alien Tae-hyung, get cooking lessons from Seok-jin, figure out how to deal with awkward Jung-kook who won't even look at her, cope with Ho-seok's random yelling, stop Ji-min from lifting his shirt (but secretly enjoying it when he succeeds), and hold a conversation with Yoon-gi without boring him to death. Lord have mercy.