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On Christmas Day, 14 years ago, Joonyoung and Eunhyuk became step brothers after their parents remarried. However, their parents soon passed away in a car accident and Eunhyuk became the only person Joonyoung could depend on. To Joonyoung, Eunhyuk was the perfect guardian as well as savior. But upon a certain incident, Eunhyuk's existence took on a different meaning to Joonyoung.
Osananajimi wa boku no hero!