Soo-yeong and Hae-soo are college friends stuck in a love tangle: Soo-yeong likes Che-moo, but Che-moo likes Hae-soo. Meanwhile, Hae-soo likes Dae-in, but Dae-in likes Soo-yeong. Despite the mixed-up feelings, they end up in mismatched marriages. Later, Hae-soo wants to have a baby and tries to get closer to her husband, Dae-in. But Dae-in knows he can’t have children, so he secretly makes a surprising proposal to Soo-yeong’s husband, Che-moo.