When Kwon Doha, a struggling web novelist, finds himself in an unexpected marriage with Jiyeon, one of three sisters who once tormented him, his life takes a chaotic turn. As Jiyeon is sent overseas for work, her empty home becomes a playground for her two sisters—Jisoo, a sultry divorcee, and Jina, a bold college student. The odd cohabitation stirs unexpected emotions as Doha is torn between Jisoo's provocative allure and Jina's carefree spirit. As old feelings resurface and new temptations arise, Doha is caught in a tangled web of desire, guilt, and forbidden attraction. Will he find clarity amidst the chaos, or will he be forever trapped between the two sisters?