Kim Yeri (OC) a 18 year old high schooler ,wants to find her 22 Years old sister , Kim Yemi, who is working in Pledis Entertainment as a producer. And Kim Mingyu confessed to her at SEVENTEEN's dorm. What would she do? Would she reject this handsome guy or accept him? As for her sister she faces the same thing but from Yoon Jeonghan . How will the pair of sisters react?