Yong Dayeon was EXO’s number one fan. She went to all their concerts and fan meets. She bought thousands of dollars’ worth of merchandise. She even waited outside the SM Entertainment building at unworldly times to try to catch a glimpse of EXO members.

After seeing something they weren't supposed to, siblings Kyungsoo and Jisoo are aided by the Witness Protection Program and go into hiding. Under fake identities, the two must find their place in society and overcome the many obstacles thrown at them. One of them being the vicious world of high school.