Begins with MC1 and FMC1 (So-Eun) on honeymoon meeting a hot couple. They entwine and then decide to forget it when they return home. But they can't since compatibility was insane. Inevitably they meet up again in Korea and reignite the flames. After a few dozen chapters, they decide to live together as a 4some while they work together on a project (MC2 and his wife Joo-Hee run an online swimsuit company). But by then things have gotten complicated with the leading pair from 17 Sexual Fantasies show up when MC1 and Joo-Hee are on vacation and they swap there. All this while MC2 and So-Eun have been spiraling as So-Eun's extreme submissiveness and MC2's kinks (watching, public, 3some) manifest. Then separately, they all come to this 'watch club' and participate in kinky games on stage where other couples bet money. Soon, a villain is revealed who has organized an elaborate game where you earn money by women having multiple partners. This is where things get screwy with no real idea of why this is happening and why the villain is doing this except everything is so hot and exciting. Scenes are awesome and women are sexy as hell. It ends with some fighting, some angst and lot of sex. All ends well in the end and everyone is happy.