Dear X — Characters & Cast

Originally motivated by basic survival and escaping her abusive father, her ambition evolves into an obsession with reaching the highest social status so no one can ever look down on or abandon her again.

Transforms from an abused child surviving domestic nightmare into a calculating high school student, then a top-tier actress, and ultimately a trapped, paranoid figure unraveling under her own web of lies.

Driven by an unconditional love and guilt over Ah-jin's childhood trauma, which gradually shifts into a tragic obligation to bring about her downfall to save her from complete monstrosity.

Begins as Ah-jin's protective stepbrother and blind enabler, evolves into an agonizingly conflicted confidant, and ultimately chooses a destructive path to halt her dangerous rampage.

Finds his reason for existence purely through Ah-jin; his motivation remains steadfastly centered on protecting her, even at the cost of his own life.

Grows up under severe paternal abuse, bonds with Ah-jin through mutual scars, and becomes her shadowy operative who carries out dark tasks without hesitation, culminating in an ultimate sacrifice.

Wants to maintain her status in the entertainment industry and secure Jun-seo's affection, driving her to investigate Ah-jin's hidden past.

A top star and former idol who feels her career and romantic interests threatened by Ah-jin's sudden rise, evolving from an arrogant senior into a desperate rival attempting to unmask Ah-jin.

Driven by an obsessive need for absolute control and ownership over Ah-jin's life and career.

Introduced as a powerful, controlling figure who recognizes Ah-jin's true nature, becoming her husband and eventual captor who chips away at her sanity.