When Yoon Seo-ah dies alone in modern Seoul, she never expects to awaken in the past — not as a villainess, not as a noble, but as the **princess who was erased from history**.
Ten years ago, the Valmoran Empire buried the truth: the firstborn heir was a girl — **Princess Seraphina**, marked by the legendary Crimson Sigil. Fearing a prophecy that claimed she would burn the empire to ashes, the royal family faked her death and sent her into the mortal world, raising her twin brother Lucien as the sole prince.
Now, Seo-ah has returned — to a world that doesn’t remember her, a throne that isn’t hers, and a brother who sees her as a threat. Armed only with the forbidden **Crimson Flame**, a power that burns lies and steals her life with every use, she must decide: reclaim her birthright and risk war, or let the empire crumble under the weight of its own deception.
But as forgotten memories ignite and magic begins to fail, one truth becomes undeniable —
**She was never the monster.
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Crimson Vow: I Was The Princess All Along Comments