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Orphaned, Nam Yujin grows up with the three Nam brothers, with the promise that one of them will marry her on her coming-of-age. But upon the return of their true sister Nam Sua, Nam Yujin loses their love and sinks into desperation. Even when she marries her suitor Ha Jihoon, they deem her as attention-seeking and only regret after unveiling Nam Sua's true colors—but Nam Yujin is never coming back.