Ditto

During a lunar eclipse, mechanical engineering student Kim Yong connects with fellow student Kim Mu-nee via a vintage HAM radio borrowed from his best friend. Kim Mu-nee needs an interviewee for her term paper, and so the two agree to meet the next day. Although both arrive on time and at the same location, they somehow manage to miss each other. At first confused and frustrated, they soon discover something altogether impossible – they're living in two different time periods: Kim Yong is living in 1999, and Kim Mu-nee is living in 2022. But despite the insurmountable time difference separating them, both students form a deep bond via their radio communications, exploring their friendships, romances, and helping each other navigate some of life's hardest decisions.