Hong Euijin knew Park Jimin from a long time back, but never found it in herself to openly confess when Jimin unknowingly broke her heart by dating some other girl. Many years had passed, and now after striving so hard to fulfill her dream of becoming a successful idol she joined The Unit - an idol rebooting program. Only to meet Lee Euijin, a boy who shares the same name as hers, but is a mirror replica of her old love. In this journey for Euijin to fulfill her dream, will she be able to forget Jimin? Or will she fall for him again,- not him but his twin like boy Lee Euijin?