Trying to avoid her stalker neighbour, Kim Hana ends up running errands late as a sudden unexplained phenomenon traps her and the CEO of her new job, Kang Seo Joon in a transverse plane to be contract killers. Struggling to keep their life private from their colleagues while pretending to be husband and wife in the transverse plane, they rely on each other to get out of the situation they suddenly found themselves in, no matter the cost.