Yoo Sera and Ji Yoon-jae were childhood neighbors who shared a sibling-like bond. After Yoon-jae moved away and lost contact, the two reunite as neighbors once they reach adulthood. Their joyful reunion is short-lived, however, as Yoon-jae witnesses Sera's fiancé cheating on her just before their wedding. In an attempt to break the news, Yoon-jae ends up spending a passionate night with a drunken Sera...
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