Lilith has long been in love with her Boss, Hyung Woo. Without expecting his feelings to be reciprocated by his Boss. He has never seen a man who looks like her Boss and is dating Lilith. But one night after it was announced that her Boss was engaged to another woman, what Lilith got was not heartbreak but a perfect offer from her Boss, a proposal that surprised Lilith. "Be my sleeping partner." How should Lilith manage her Boss's request?