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Abandoned by her first love, Im Eun-ju impulsively accepts Kim Woo-jin's proposal. Woo-jin gives up his dream of becoming a doctor and becomes a stay-at-home husband to develop a cure for Eun-ju's allergy. Despite his devotion, Eun-ju remains indifferent toward him. When her first love returns, Woo-jin voluntarily divorces her so she can reunite with him. By the time Eun-ju realizes her mistake in letting him go, he has long since left her world to pursue his dream.