Ditto Hangul RRDonggam lit. Sympathy or The same feeling is a 2000 South Korean sciencefiction romance film directed by Kim Jungkwon. Two students in the same school, one in 1979, the other in 2000, are somehow able to talk to each other using amateur radio.
At home, one night, she is awakened by a call on her radio, from another radio enthusiast, Ji In Yoo Jitae. They discover that they attend the same university and plan to meet in front of the school clock tower, where Ji In offers to lend Soeun a book for amateur HAM radio operators. At the set time, both wait for the other, Soeun in front of an unfinished clock tower in the heat and dust, and Ji In in front of a completed one, in heavy rain. Later at night, they argue about the why the other person did not show up, and about the weather, and Ji In is suddenly shocked to discover he is speaking over a radio with a disconnected power plug. Further, Ji In, is then jolted with the information which Soeun reveals she is a Junior in 1979, he is a sophomore in 2000. At first he begins to doubt Soeuns words, but is slowly convinced despite the improbability of what is happening to him.Meanwhile, Soeuns relationship with Donghee is progressing well, and they end up dating. Soeun talks about her newfound relationship with Sunmi at the hospital, but is not able to spend as much time with her now. Ji In is close to a girl at school Seo Hyeonji Ha Jiwon whom he takes for granted as she is always hanging around him, but for whom he comes to care for deeply. Soeun is increasingly irritated with the conversations she has with Ji In over the radio, thinking he is lying about living in the year 2000. He then offers her some snippets from her future and his past, which finally make her believe that Ji In has been speaking the truth. Soeun then excitedly asks him about the future, and they also start to confide in each other about their personal lives, Ji In telling Soeun to think of him as a sort of diary that talks. She begins talking about being in love, and Donghee. ........
Source: Wikipedia