Su-hyun (played by Lee Mi-sook) has a happy family, a clever and lovable 10-year-old son, and a successful architect husband. Although her life is affluent, Su-hyun feels a sense of dissatisfaction and anguish inside. At this moment, her sister's fiancé, Yoo-in (played by Lee Jung-jae), enters her life. This boy, who is 10 years younger than Su-hyun, deeply captivates her, and Yoo-in also has a great affection for Su-hyun. As they gradually get to know each other better, they unexpectedly fall in love, but Yoo-in is about to marry Su-hyun's sister.
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