Sky of Love(2003)

Xiao Jia, a university student, secretly admires her class monitor, Wen Tao. In a twist of an event, Xiao Jia accidentally gets hold of a radiophone. One day, as she daydreams of Wen Tao, the radiophone connects to Jia Hui and they start communicating through the radiophone. From their conversations, they discover that they are actually studying in the same school and plan to meet up, but both of them miss the date and finally find out that they exist in two different worlds.