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By chance, the male protagonist has had a crush on the female protagonist since he was a child. The female protagonist's heart-warming actions in the male protagonist's eyes have planted the seeds of fate in his heart time and time again. Over the years, although the heroine occasionally heard her parents talking about him, she never had face-to-face communication due to various reasons. The heroine never thought that her younger brother was him. But the male protagonist has always been obsessed with her warmth back then. Although the female protagonist may have forgotten it, the male protagonist has never forgotten it in his heart when he saw her photo. After hearing about her, he was very concerned about it. Can he, who is introverted but persistent by nature, really be able to do what he always wants?