I will not be shadowed by my twin sister in this life [siren scan]

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I will not be shadowed by my twin sister in this life [siren scan] summary: Just before she died, she realized the truth: she had been deceived her entire life by her perfect twin sister. Shocked by the betrayal, she wished she could just close her eyes and be done with it... But when she woke up, she had returned to her childhood!? To keep the fact that they are twins from being discovered, she must play a single princess together with her sister! Now that she’s been given a second chance, she won’t live a life of being tormented by her sister like in her previous life. She’ll claim for herself the family relationships she longed for, and the friendships she wanted. Even the healing power she hadn’t noticed in her reincarnation — she’ll make it all hers! Around that time, she accidentally meets a talking bird named 'Yang'. The bird says that if she doesn’t protect it, the kingdom will be destroyed — what does that mean? Can I really survive?