The story centers around Doha, who, from a young age, was often bullied by the three sisters, Jisoo, Jiyeon, and Jina. As an adult, Doha unexpectedly ends up sleeping with Jiyeon after a drunken night, which leads to their marriage. While Doha struggles to keep up with Jiyeon's high libido, their newlywed bliss is short-lived as Jiyeon is sent overseas for work. Just when Doha begins to enjoy his newfound freedom, his home is suddenly invaded by his sister-in-law, Jisoo, and his younger sister-in-law, Jina, setting the stage for a chaotic and unpredictable storyline.