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With their parents' divorce, Doyeon and Eunha, who had become a family through their parents' remarriage, turned back into strangers.
After several years, they meet again, and Eunha had become obsessed with Doyeon. While Doyeon finds this clinginess from his brother burdensome... what he dislikes even more is realizing that his feelings towards Eunha are not simply 'brotherly love...'