Luna decides to have a concert in their home and so Yoon Joo has to stay elsewhere for one day. She tells everyone that she's staying in a nearby hotel. Tae In prepares breakfast for Yoon Joo while Woo Yeon decides to take start courting Yoon Joo as well and goes to the hotel she's supposed to be living in. He sees Yoon Joo's twin sister at the hotel while talking to Yoon Joo on the phone. Things might start ruining for Yoon Joo. (Source: XieLalisa at MyDramaList)