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In 2050 Seoul, astronaut Nan-young has spent her life working toward Mars, where her mother, also an astronaut, never came back from her own mission. Right after Nan-young fails the final test for the fourth Mars expedition, an old turntable she inherited from her mother leads her to Jay, a musician who has buried his own dreams in a vintage audio repair shop. The two fall in love and start rooting for each other's futures, until Nan-young is offered another chance to fly to Mars.