It’s the Spring Festival travel rush, and this year it runs all the way to Mars. Liu Dasuo, a migrant worker on the red planet, wants nothing more than to get home to Earth for New Year’s Eve dinner. Instead, he gets stuck with Han Meimei as his travel partner, a man with a secret of his own: he is an observer sent by an alien civilization. Their partnership begins with a misunderstanding, and from there the trip home only gets harder.