"X" Marks Her Next Victim.
Behind a beautiful face hides a cruel nature—Baek Ah-jin, who sees through and manipulates others' hearts. After stepping on the sacrifices of many to reach the top, everything begins to change the moment she arrives there. A woman wearing a mask to escape hell and climb to the highest place. And the story of the Xs being brutally crushed by her.
When Sung-hee attempts to expose Ah-jin's secrets, she strikes back with the help of fellow classmates.
Ah-jin is accepted into her dream law school, but her dreams are crushed when her father returns.
With her dream shattered, Ah-jin begins to work at a cafe and secretly schemes to manipulate Jung-ho.
As suspicions fall on Ah-jin with nowhere to turn, she is approached by Mi-ri, who steps in to save her.
Ah-jin makes her debut as an actress and grows increasingly wary of Lena.
Determined to advance her career, Ah-jin sets her sights on top star, Heo In-gang.
Ah-jin's year-long romance with In-gang deepens, but her past is at risk of being exposed.
After his grandmother's passing, In-gang proposes, but Ah-jin ends their relationship instead.
As Ah-jin faces public backlash for her break up with In-gang, a wealthy savior comes to her rescue.
Jun-seo learns the secret of his birth and leaves Ah-jin’s side while she marries Do-hyuk.
Ah-jin discovers the unnerving truth about her husband. Desperate to break free, she turns to Jae-oh.
Ah-jin’s deepest darkest secrets are revealed just as she rises to the very top.
