After the tragic death of her family, Hae Mi Hyang is adopted by Jang Hyun, a man with a shadowy past, and takes on the new identity of Jang Eun Sook. Transformed into a ruthless assassin, she embarks on a quest for vengeance. In a parallel storyline, Seo Jin is on his own mission of retribution, determined to track down the assassin responsible for his father's murder. As their paths converge, a complex web of revenge, secrets, and dark pasts unfolds.
