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The show aims to show the psychological differences between blood types.

When Shiho Nishina got worried about her sex life with her husband, her husband proposed to her, "Why don't we go to a couple exchange party?" At first Shiho strongly turned down the idea, but eventually, she gave in because her husband was very persuasive. "We're just going to observe, okay?" Shiho said as she reluctantly agreed to it. Meanwhile, a former diplomat Mr. Kubozuka ran a couple exchange club, "Aquarium," with his wife in their house. At first, Shiho was being very cautious, but gradually, she got attracted to Mr. and Mrs. Kubozuka's charm and finally agreed to exchange couples with them. It seemed that their sex problem had disappeard and they had found happiness, but as it turned out, that was just the beginning of their nightmare...

The sweet and bitter love stories of three women.

Shin Gi-na (Lee Min-Jeong), a former leader of a popular girl group, now host of radio show called Wonderful Radio. When the producer is sacked due to low ratings, new guy Lee Jae-ik (Lee Jung-jin) is hired in his place. Lee is cold and unfriendly who only drinks iced coffee even in winter. The easily irritable Lee and the conceited former diva constantly gets on each other's nerves. During yet another argument with Lee, Shin comes up with an idea for a new feature - invite a listener to the studio to read out their story and sing a song. It turns out to be a surprise success. Over time, Lee and Shin learn more about each other and gradually they grow closer.[2]